Description : Fields that act on objects with masses are A. electric fieldsB. magnetic fields C. force fields D. gravitational fields
Last Answer : gravitational fields
Description : Magnetic fields are produced by: w) resistance x) an electric potential difference y) electric current z) stationary charge
Last Answer : ANSWER: Y -- CURRENT
Description : In an electromagnetic wave, what is the relative orientation of the magnetic and electric fields? w) 180 degrees x) 90 degrees y) 45 degrees z) 22.5 degrees
Last Answer : ANSWER: X -- 90 DEGREES
Description : In troubleshooting a circuit in a console, you find that a resistor may be faulty. Which of the precautions listed must be observed when using an ohmmeter to carry out this test? A. Correct polarity ... D. The resistor's circuit must be de-energized and at least one end of the component isolated.
Last Answer : Answer: D
Description : While troubleshooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an ohmmeter is to be used to ... of the component isolated. D. The meter case must be grounded prior to attaching the leads.
Last Answer : Answer: C
Description : In a cathode ray tube, electric and magnesity of the magnetic fields are simultaneously applied at right angles to each other and the intensity of the
Last Answer : In a cathode ray tube, electric and magnesity of the magnetic fields are simultaneously applied at right angles to each ... 01 T` and `E=50,000 V//m`.
Description : The forces of cathode ray particles due to electric and magnetic fields which are at right angles to each other balance each other. If the magnetic fi
Last Answer : The forces of cathode ray particles due to electric and magnetic fields which are at right angles to ... p.d. is required to produce this velocity?
Description : A charged particle with a velocity `2xx10^(3) ms^(-1)` passes undeflected through electric field and magnetic fields in mutually perpendicular directi
Last Answer : A charged particle with a velocity `2xx10^(3) ms^(-1)` passes undeflected through electric field and magnetic fields ... 1)` D. `1.33xx10^(3)NC^(-1)`
Description : What kinds of waves are produced by disturbances in electric and magnetic fields?
Last Answer : Feel Free to Answer
Description : What is meant by referring to electromagnetic waves as horizontally polarized? A. The electric field is parallel to the earth. B. The magnetic field is parallel to the earth. C. Both the electric and magnetic fields are horizontal D. Both the electric and magnetic fields are vertical
Last Answer : A. The electric field is parallel to the earth.
Description : What are electromagnetic waves? A. Alternating currents in the core of an electromagnet B. A wave consisting of two electric fields at right angles to each other C. A wave consisting of an electric field ... to each other D. A wave consisting of two magnetic fields at right angles to each other
Last Answer : C. A wave consisting of an electric field and a magnetic field at right angles to each other
Description : What are electromagnetic waves? A. A wave consisting of two magnetic fields at right angles to each other B. A wave consisting of an electric field and a magnetic field at right angles to each ... core of an electromagnet D. A wave consisting of two electric fields at right angles to each other
Last Answer : B. A wave consisting of an electric field and a magnetic field at right angles to each other.
Description : What is meant by referring to electromagnetic waves as horizontally polarized? A. The electric field is parallel to the earth B. Both the electric and magnetic fields are vertical C. Both the electric and magnetic fields are horizontal D. The magnetic fields is parallel to the earth
Last Answer : A. The electric field is parallel to the earth
Description : An electromagnetic wave consists of A. a magnetic field only B. both electric and magnetic fields C. an electric field only D. non-magnetic field only
Last Answer : B. both electric and magnetic fields
Description : The waves associated with electric and magnetic fields, resulting from the acceleration of an electric charge are called
Last Answer : electromagnetic waves.
Description : The electric and magnetic fields vary with time in which of the following fields? a) DC b) AC c) Static d) It does not vary with time
Last Answer : b) AC
Description : The phase shift in the electric and magnetic fields in an EM wave is given by which parameter? a) phase constant b) attenuation constant c) propagation constant d) intrinsic impedance
Last Answer : d) intrinsic impedance
Description : In good conductors, the electric and magnetic fields will be a) 45 in phase b) 45 out of phase c) 90 in phase d) 90 out of phase
Last Answer : b) 45 out of phase
Description : In electric fields, D= ε E. The correct expression which is analogous in magnetic fields will be a) H = μ B b) B = μ H c) A = μ B d) H = μ A
Last Answer : b) B = μ H
Description : Which one of the following statement is incorrect regarding the electromagnetic radiation? (A) These are produced by the motion of electric charge (B) The oscillation of charged particles sets up ... electric fields induce the changing magnetic fields in the surrounding medium (D) None of these
Last Answer : Answer: Option D
Description : How do magnetic fields around connected conductive materials take shape?
Last Answer : I think that while the current supplied by the wire is flowing through the metal balls they will generate a magnetic field in the same way a field surrounds a wire with electricity flowing through it. ... that in the same way it passes between atoms in a wire their magnetism will not repel them.
Description : When current is parallel to magnetic fields, force on conductor is A. zeroB. infinite C. 2 times D. same
Last Answer : zero
Description : In the Millikan oil-drop experiment the UPWARD force on the drop is due to the: w) gravitational and electric fields x) gravitational field and the charge on the drop y) electric field and the size of the drop z) electric field and the charge on the drop
Last Answer : ANSWER: Z -- ELECTRIC FIELD AND THE CHARGE ON THE DROP
Description : Two or more objects or ideas observed for their differences?
Last Answer : outline or contrast
Description : The objectives of mental health in education can be achieved, if the following principles are observed in the curriculum. (a) The child's need, interest and experiences individual differences in learning on ... flexible and adjustable to the needs of pupils at every stage (d) All of the above.
Last Answer : d) All of the above.
Description : 7. List two methods of producing magnetic fields. -Physics-10
Last Answer : Following are the methods of producing magnetic fields: By using a permanent magnet we can produce magnetic field and it can be visualized by spreading iron fillings on a white paper and keeping a ... conductors such as solenoid and circular loop can be used to see the presence of magnetic field.
Description : What type of star have extremely intense gravitational and magnetic fields?
Description : What is the relationship between the strength of magnetic fields and the distance between 2 magnets?
Last Answer : Need answer
Description : Which of the substances listed can be used to shield sensitive equipment from static magnetic fields? A. Glass B. Mica C. Bakelite D. Permeable iron
Description : For more complete vessel protection when using an impressed current cathodic system _____________. A. all ship's service alternators have additional temperature sensing devices and a thermal recorder ... with the hull and the propeller shaft is grounded through a slip ring/brush arrangement
Description : The purpose of an impressed current cathodic protection system aboard ship is to _______________. A. prevent corrosion of the hull, propeller, rudder and line shafting B. neutralize the vessel's ... the presence of salt air D. maintain a minimum constant alternator load to prevent overheating
Last Answer : Answer: A
Description : One method of testing for a reversed shunt field coil in a DC generator or motor is by connecting the field to a direct current source, at reduced field rated voltage, and test for ... placed near each field C. test lamp across adjacent fields D. copper jumper across the interpole connections
Last Answer : Answer: B
Description : The polarization of a radio wave: A. Is perpendicular to the electrostatic field of the antenna B. Is the same direction as the electrostatic field of the antenna. C. Is the same direction ... field of the antenna. D. Is perpendicular to both the electrostatic and magnetic fields of the antenna.
Last Answer : B. Is the same direction as the electrostatic field of the antenna.
Description : It cannot be determined from Gauss law, whereas the remaining options can be computed from Gauss law. 10. Gauss law for magnetic fields is given by a) Div(E) = 0 b) Div(B) = 0 c) Div(H) = 0 d) Div(D) = 0
Last Answer : b) Div(B) = 0
Description : The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded by strong magnetic fields (b) a soft ... is used (c) a plastic shielding is provided (d) a shielding of anon-magnetic material is used
Last Answer : (b) a soft iron shielding is used
Description : Why should you never place floppy disks near telephones or other electronic equipments that generate magnetic fields?
Last Answer : Magnetic fields can destroy the data on a disk.
Description : What is that instrument used for measuring the strength and direction of magnetic fields?
Last Answer : magnetometer
Description : Type of power-line frequency meter device utilizing a principle of balancing an indicator needle at center of a scale using magnetic fields opposing each other.
Last Answer : magnetic type
Description : The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for a (A) dc machine. (B) 3 phase induction machine. (C) synchronous machine. (D) single phase induction machine.
Last Answer : Ans: all options are correct
Description : Optic fibres are used in place of wire cables because (1) they generate strong magnetic fields (2) they do not generate magnetic fields (3) they do not require boosting (4) they are more economical
Last Answer : they do not generate magnetic fields
Description : The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are A) Perpendicular B) Parallel C) Inclined at 60" D) Inclined at 30°
Last Answer : The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are Parallel
Description : In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from (A) current in the potential coil (B) both voltage and current in the ... (C) directional element and non-directional element (D) non-directional element and the trip circuit
Last Answer : In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from directional element and non-directional element
Description : What is direction of the electric fields field near the earth's surface?
Description : On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. Speeds above this are obtained by _____________. A. rotating brush ... B. raising the generator engine speed C. lowering the generator engine speed D. decreasing excitation
Description : As a result of electric current a magnetic field is created around it , from whose test can it be realized ?
Last Answer : An electric current creates a magnetic field around it , as can be seen from Hans Christian Werstead's experiments.
Description : Flemings "Left hand Rule" is associated with the effect of – (1) Electric field on current (2) Magnetic field on magnet (3) Electric field on magnet (4) Magnetic Field on current
Last Answer : (4) Magnetic Field on current Explanation: Whenever, a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor ... conductor. In both of the phenomenon, there is a relation between magnetic field, current and force.
Description : Ultrasonic waves are produced by making use of - (1) ferro magnetic material (2) ferri magnetic material (3) piezo electric material (4) pyro electrical material
Last Answer : (3) piezo electric material Explanation: In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
Description : A current carrying conductor is associated with – (1) a magnetic field (2) an electric field (3) an electro-magnetic field (4) an electrostatic field
Last Answer : (3) an electro-magnetic field Explanation: A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
Description : Moving electric charge produces - (1) magnetic field (2) sound waves (3) light rays (4) heat waves
Last Answer : (1) magnetic field Explanation: An electric charge always produces an electric field, regardless of speed, and a moving charge generates a magnetic field. An electric current passing through a conductor produces a magnetic field because it has many charges in motion.
Description : Which physical quantity is measured in ‘siemens’? (1) Electric potential (2) Electrical conductance (3) Magnetic flux (4) Refractive index
Last Answer : (2) Electrical conductance Explanation: The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).