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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 3  FOR BOARD EXAMINATION

QUESTION NO. 55

A coil of insulated copper wire is connected to a galvanometer. What would happen if a strong bar magnet is.
(a) Pushed into the coil ?
(b) Withdrawn from inside the coil ?
(c) Held stationary inside the coil ?
 Give justification for each observation.

ANSWER NO. 55

(a) When a bar magnet is pushed into the coil of insultated copper wire connected to a galvanometer, an induced current is set u in the coil due to change of magnetic field through it. As a result, galvanomter gives a deflection.
(b) When the bar magnet is withdrawn from inside the col, again an induced current is setup in the coil due to change of magnetic field through it . As a result galvanometer gives a deflection in the reverse direction.
(c) If the bar magnet is held stationary inside the coil, then there is no induced current in the coil, because there is no change in magnetic field through it. So, galvanometer does not show any deflection.

QUESTION NO. 56

Two circular coil P and Q are kept close to each other, of which coil P carries a current. What will you observe in the galvanometer connected across the coil Q.
(a) if current in the coil P is changed ?
(b) if both the coils are moved in the same direction with the same speed.

ANSWER NO. 56

(a) When current in P is changed, the field associated with coil Q will vary causing an induced current Q, and the galvanometer will be deflected.
(b) If both the coils are moved in the same direction with same speed, there will not be any change in the field associated with Q. Hence no current will be induced in Q. Hence there will be no any deflection in galvanometer.



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