Description : What is the difference between the domain theory and Weber’s theory of magnetism?
Last Answer : The domain theory is based upon the electron spin principle; Weber’s theory uses the concept of tiny molecular magnets.
Description : Magnetic lines of force have all but one of the following characteristics. The one that they DO NOT have is: w) they go from the South-pole to the North-pole of a magnet outside of the magnet ... most concentrated at the poles of a magnet y) they pass through copper z) they never cross one another
Last Answer : ANSWER: W -- THEY GO FROM THE SOUTH-POLE TO THE NORTH-POLE OF THE M AGNET
Description : How will we find out the north pole and south pole of a bar magnet with no markings to indicate poles?
Last Answer : If you roughly know where North is, tie the bar magnet to a piece of thin string so it balances horizontally and let it dangle. Once it stops spinning and waving about, one end should point North. Mark this end as with an N for north.
Description : The dipole formation in a magnet is due to a) Interaction between the north and south poles together b) Interaction between the north pole with the air c) Interaction between the south pole with the air d) Interaction of north and south pole separately with air
Last Answer : a) Interaction between the north and south poles together
Description : Fleming's left hand rule is used to find (a) direction of magnetic field due to current carrying conductor (b) direction of flux in a solenoid (c) direction of force on a current carrying conductor in a magnetic field (d) polarity of a magnetic pole
Last Answer : (c) direction of force on a current carrying conductor in a magnetic field
Description : Which of the listed conditions will occur if the polarity of the field poles and the direction of current to the brushes of a DC motor were both reversed? A. The motor would not start. ... direction of rotation of the armature would be unchanged. D. The field pole windings would become overheated.
Last Answer : Answer: C
Description : Which of the following statements describes what will happen when both the polarity of the field poles, and the direction of current to the brushes of a DC motor are reversed? A. The motor will ... of rotation of the armature will remain the same. D. The field pole windings will become overheated.
Description : The direction of magnetic lines of force is (a) from south pole to north pole (b) from north pole to south pole (c) from one end of the magnet to another (d) none of the above
Last Answer : (b) from north pole to south pole
Description : What type of magnetic material should be used to make a temporary magnet?
Last Answer : A material that exhibits low reluctance and high permeability, such as iron or soft steel.
Description : 8. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current–carrying solenoid with the help of a bar magnet? Explain. -Physics-10
Last Answer : A solenoid is a long coil of circular loops of insulated copper wire. The magnetic field produced around the solenoid when the current is passed through it is similar to the magnetic field ... shows the arrangement of magnetic fields produced around the solenoid when current is passed through it.
Description : In replacing a defective transformer with a new one, which of the following actions must be carried out to insure proper operation of the equipment it serves? A. The secondary leads must be grounded ... magnetize it. D. The iron core must be grounded for 10 minutes to remove any residual magnetism.
Last Answer : Answer: B
Description : Magnet chatter or 'pumping' occurring in a magnetic contactor can be caused by ______________. A. dirt or grease on pole faces B. mechanical interference in the contacts C. chattering contacts on the control relay D. magnetic lock out of the contacts
Description : The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these
Last Answer : c) make the magnetic field radial
Description : If you are given some iron fillings and a magnet describe how you would find the poles of the magnet?
Last Answer : If possible cover the magnet with a sheet of paper and gentlysprinkle the iron filings over the sheet ot paper, they will stickin a pattern following the magnetic "lines of flux" which will ... . Without the paper thefilings will usually become tightly stuck to the magnet, making ithard to clean.
Description : True meridian of different places (A) Converge from the South Pole to the North Pole (B) Converge from the North Pole to the South Pole (C) Converge from the equator to the poles (D) Run parallel to each other
Last Answer : (C) Converge from the equator to the poles
Description : In a four-pole D.C. machine (a) all the four poles are north poles (b) alternate poles are north and south (c) all the four poles are south poles (d) two north poles follow two south poles
Last Answer : Ans: b
Description : If a bar magnet, tied in the middle with a thread, were suspended at the north pole of the earth, it would take (a) a horizontal position (b) a nearly vertical position with its north pole pointing downward (c) a vertical position with its south pole pointing downward (d) a slanting position
Last Answer : Ans:(b)
Description : The south pole of the earth’s magnet is near the geographical ________. (1) south (2) east (3) west (4) north
Last Answer : (4) north Explanation: The South Pole of the Earth's magnet is in the geographical North because it attracts the North Pole of the suspended magnet and vice versa. Thus, there is a magnetic S-pole near the geographical North, and a magnetic Npole near the geographical South
Description : The strongest part(s) of a magnet is/are -----? A. North pole B. South pole C. North and south pole (Answer) D. Median of north and south pole
Last Answer : The strongest part(s) of a magnet is/are -----?A. North poleB. South poleC. North and south pole (Answer)D. Median of north and south pole
Description : Division of labor, authority hierarchy, formal selection, formal rules and regulations, impersonality, and career orientation are all features of: (a) Weber's ideal type bureaucracy. ; (b) General administrative theory. (c) Fayol's principles of management. ; (d) Taylor's principles of management.
Last Answer : (a) Weber's ideal type bureaucracy. ;
Description : Which of the methods listed is used to start a AC generator turning? A. Residual magnetism remaining in the field poles. B. Residual magnetism remaining in the field coils. C. Residual magnetism remaining in the armature. D. Rotation by a mechanical prime mover.
Last Answer : Answer: D
Description : I just held a lighter to a magnet and it lost its magnetism. Why?
Last Answer : This is too science-y for me but there’s a well-documented experiment here concluding the fact that heat reduces magnetic fields (or force, or whatever).
Description : When a piece of iron is rubbed with a magnet it acquires magnetism ' What kind of change is this and why ?
Last Answer : When a piece of iron is rubbed by a magnet, it acquires magnetism ' is a physical or positional change. This is because when rubbed by a magnet, no other substance is formed from iron. Again , when a piece of magnetized iron is heated, it loses its magnetism and is converted into ordinary iron.
Last Answer : Magnetism of a magnet A: Physical properties.
Description : What is a magnet that does not keep its magnetism very long?
Last Answer : This would be a temporary magnet.
Description : What is a magnet that retains its magnetism?
Last Answer : We generally refer to this as a permanent magnet.
Description : Magnetism at the centre of a bar magnet is
Last Answer : around- zero
Description : Magnetism at the centre of a bar magnet is - (1) minimum (2) maximum (3) zero (4) minimum or maximum
Last Answer : (3) zero Explanation: The field at the center is not zero, but weak. At the exact center of a magnet the field lines are parallel (straight lines if we draw it). Anywhere else they are slightly divergent.
Last Answer : Magnetism of a magnet can be destroyed by heating, hammering, by inductive action of another magnet.
Description : Magnetic field can be produced by using A. permanent magnet B. electric current C. temporary magnet D. both A and B
Last Answer : permanent magnet
Description : How does the law of magnetic poles relate to the law of electric charges?
Last Answer : They are very similar; like charges repel, unlike charges attract, like poles repel —unlike poles attract.
Description : What determines the number of field poles required to establish a rotating magnetic field in a multiphase motor stator?
Last Answer : The number of phases in the applied voltage.
Description : The direction of rotation of a DC propulsion motor can be changed by reversing the _____________. A. brush holder position B. polarity of the field poles C. brush staggered order D. motor interpole connections
Description : The speed of a multi-speed, squirrel-cage, induction motor operating in a fixed frequency system can be changed by _____________. A. reconnecting stator windings for different numbers of poles B. ... sequence of the applied voltage D. reconnecting the stator so that no poles have the same polarity
Last Answer : Answer: A
Description : How the polarity of the magnet can be determined?
Last Answer : Polarity of the magnet can be determined by ‘End rule’ and ‘Palm rule’.
Description : Are you bothered? starting on my own i never do anything like that on the subway. And it's distasteful when he gets worn enough to caress his back. Everyone take it home?
Last Answer : I don't travel by public transport, but I would consider it such an indecency.
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 : 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 : Magnetic Field on current
Description : The true meridian of a place is the line in which earth's surface is intersected by a plane through (A) East and west points (B) Zenith and nadir points (C) North and south geographical poles (D) North and south magnetic poles
Last Answer : (C) North and south geographical poles
Description : A megohmmeter can be used to test for _____________. A. an open field coil B. a shorted field pole C. undercut mica D. reversed polarity
Description : Relative to the direction of rotation, a D.C. motor commutating pole has the same polarity as the _____________. A. main pole following B. interpole following C. main pole preceding D. interpole preceding
Description : If a bar magnet is cut length wise into 3 parts, what will the total number of poles be? -General Knowledge
Last Answer : The answer is '6'
Description : A substance, when inserted between the poles of a magnet, is pushed out, what is it? -Do You Know?
Last Answer : answer:
Description : How many poles does a magnet have ?
Last Answer : 2 poles of magnet 1. North pole 2. South pole.
Description : How many poles of a magnet ?
Last Answer : : There are two poles of magnet 1) North pole 2) South pole.
Description : Is the attractive force of a magnet greatest at its poles?
Last Answer : Yes.
Description : How can we find poles of an odd shaped magnet?
Last Answer : What is the answer ?