These questions have to do with turning mechanical energy into electric potentia

Question

These questions have to do with turning mechanical energy into electric potential energy (via induction) using a magnet and a solenoid.

1) True or False: The current is stronger when the magnet is moved quickly rather than gradually.

2) True or False: A greater voltage can be induced from a solenoid with a greater number of turns in its coil.

3) When the north end of the magnet enters the coil, a current is induced that travels around the coil in a ........................................... direction; when the magnet is then pulled out of the coil, the direction reverses to ....................................................

a) clockwise, counterclockwise
b) counterclockwise, counterclockwise
c) counterclockwise, clockwise
d) clockwise, clockwise

Explanation / Answer

1.
induced emf and hence induced current is directly proportional to rate of change of magnetic field
Rtae of change of magnetic field will be large when magnet is moved quickly
Answer: True

2.
True
Induced voltage is large for large number of turns

3.
When north end enters coil, the induced current will be such that it will try to repel the magnet
So induced current will be counterclockwise
It will be clockwise when magnet is being pulled out
Aswer: c) counterclockwise, clockwise

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