Question

8. a coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (a) pushed into the coil, (b) withdrawn from inside the coil,(c) held stationary inside the coil

Answer 1

Explanation:

• Before Come to question firstly we know that what is Faraday Law .

→ According to Faraday law when there is relative motion between magnetic field and coil . Then, current induce in the coil .

Now, come to question

(a) if bar magnet pushed into the coil , magnetic field increases due to this current induced in each turn of coil.

(b) if magnet is pushed out , in this case also induce but in opposite direction

(c) when it held stationary that means there is no relative motion between coil and magnetic field . So, no current induced in the coil

Answer 2

$\huge\underline\mathfrak\pink{Answer}$

(i) when magnet is pushed near a bar magnet then it induces current due to electromagnetic induction.

(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper wire again the current is induced in the coil but this time it is in reverse direction.

(iii) When a bar magnet is held stationary inside the coil then no current is induced that’s why galvanometer will show no deflection.