20. A bar magnet is moved in and out of a coil that is connected to a galvanometer.
The meter needle swings to the left when the bar magnet is moving towards the coil.
(0) How the needle behaves when the bar magnet is at rest?
(a) swings towards left (b) swings towards right
(c) does not move
(d) swings towards the left then come back.
(ii) How the needle behaves when the bar magnet is at rest and the coil is moving away
from the magnet?
(a)swings towards left (b) swings towards right
(c) doesn't move
(d) swings towards left then come back.
(iii) in which condition the meter needle swings to the left ?
(iv) Draw magnetic lines of force in a solenoid.
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Answer:
A magnet and a coil of wire can be used to produce an electric current. A voltage is produced when a magnet moves into a coil of wire. This process is called electromagnetic induction . The direction of the induced voltage is reversed when the magnet is moved out of the coil again
Explanation:
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