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.
Description : Which energy is converted into which energy when iron is converted to magnet ?
Last Answer : When iron is converted to magnet, magnetic energy is converted into heat energy.
Description : Which is the most permanent strong magnet ?
Last Answer : The most durable strong magnet is nickel.
Description : Who Discovered the Magnet Theory ?
Last Answer : Dr. discovered the theory of magnetism. Gilbert.
Description : Who was the first to show the process of making a magnet with electricity ?
Last Answer : In 1820 , Arstad first showed the subject.
Description : What is the chemical signal of magnet ?
Last Answer : The chemical signal of the magnet is Fe3O4
Description : What does a permanent magnet repel?
Last Answer : – Diamagnetic substances only
Description : The method of magnetization is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it
Last Answer : (1) hammering a magnet Explanation: Hammering a rod will either allow it to become slightly magnetic inlaid along a magnetic field (i.e.North - South) or demagnetize it if laid across the field lines (i.e. East-West). A current passing through a coil will produce a magnetic field.
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 : 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 : For which among the following house appliances, magnet is an essential part? (1) Calling bell (2) Fan (3) Washing machine (4) All of the above
Last Answer : (4) All of the above
Description : When a bar magnet is cut into two equal halves, the pole strength of each piece (1) becomes double (2) becomes half (3) becomes zero (4) remains the same
Last Answer : (4) remains the same Explanation: The poles remains same whether the magnet is cut into two equal half or more and also pole strength remains same but magnetic moment reduces due to decrease in the length of ... is called north pole (N-poled of the magnet and the other end the south pole (S-pole).
Description : Tape recorder should not be kept near one of the following things – (1) Clock (2) Magnet (3) Electrical switchboard (4) Radio
Last Answer : (2) Magnet Explanation: The cassette tape contains a magnetic strip wound around two spools. Tiny magnetic particles are randomly scattered throughout the tape. A tape recorder should not be kept ... material to be pushed and pulled out of place. Rearranging the magnetic particles erases the sound.
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 : Induced current in coil by a magnet turns it into an A. straight wire B. magnet C. ammeter D. electromagnet
Last Answer : electromagnet
Description : By accelerating the magnet inside the coil, the current in it A. increases B. decreases C. remains constant D. reverses
Last Answer : increases
Description : A proton and an alpha particle pass through the gap of a strong magnet. If both particles have the same initial velocity, how many times greater will the defection of the proton be relative to the deflection of the alpha particle? Will it be: w) the same x) 2 times y) 4 times z) 8 times
Last Answer : ANSWER: X -- 2 TIMES
Description : The coating on the plastic tape you use in your cassette players is w) diamagnetic x) paramagnetic y) ferromagnetic z) a permanent magnet
Last Answer : ANSWER: Y -- FERROMAGNETIC
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 : In an electromagnetic wave, the ratio of the magnitudes of the electric field to the magnet field is equal to what?
Last Answer : ANSWER: THE SPEED OF LIGHT or C
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 method of magnetisation is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it
Last Answer : hammering a magnet
Description : Tape recorder should not be kept near one of the following things : (1) Clock (2) Magnet (3) Electrical switchboard (4) Radio
Last Answer : Magnet
Description : When a bar magnet is cut into two equal halves, the pole strength of each piece – (1) becomes double (2) becomes half (3) becomes zero (4) remains the same
Last Answer : remains the same