Question

26. 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(b) withdrawn from inside the coil,
​

Answer 1

Answer:

(i)When a bar magnet is pushed into the coil, there is a relative motion between the magnetic field and the coil hence a current will get induced which will deflect the galvanometer. when the bar magnet is inside the coil and not moving, the flux won't change so the galvanometer won't show deflection. And hence Overall galvanometer will deflect momentarily.

(ii) When we withdraw the coil the deflection is opposite to the above deflection. The current is due to the relative motion between the bar magnet and the coil.

Explanation:

Answer 2

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⇢(a) When a bar magnet is pushed into the coil, magnetic field lines linked with the coil changes (increases). It causes the electric current to get induced in it. The needle of galvanometer will move momentarily in one direction.

⇢(b) When a bar magnet is withdrawn from inside the coil, the magnetic field lines linked with the coil changes but in decreasing order. Current will be induced in the coil which will be indicated by deflection of needle in the galvanometer. The deflection is opposite to that in case (a). This indicates that the direction of induced current is now opposite to the direction of induced current in case (a).