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Science · 2022 · 4 marks
CBSE 2022 · Region 4 · Set 2 · Q14
AB is a coil of copper wire having a large number of turns. The ends of the coil are connected with a galvanometer as shown. When the north pole of a…
AB is a coil of copper wire having a large number of turns. The ends of the coil are connected with a galvanometer as shown. When the north pole of a strong bar magnet is moved towards the end B of the coil, a deflection is observed in the galvanometer.
(a)
State the reason for using galvanometer in the activity and why does its needle deflects momentarily when magnet is moved towards the coil.
(b)
A deflection in the galvanometer is also observed when the magnet is held stationary and the coil is moved towards the south of pole of the magnet. Why ?
(c)
State the conclusion that can be drawn from this activity. Will there be any change in the momentary deflection in the galvanometer if number of turns in the coil is increased and a more stronger magnet is moved towards the coil ?
OR What is electromagnetic induction ? What is observed in the galvanometer when a strong bar magnet is held stationary near one end of a coil of large number of turns ? Justify your answer.
Marking-scheme solution
(a)
Galvanometer is used to detect the presence of current along with its direction.
Needle deflects momentarily due to momentary change in magnetic field associated with the coil due to which current induces.
(b) When coil moves towards the magnet, the magnetic field passing through coil changes and a current is induced in the coil due to which deflection is observed in galvanometer.
(c)
The relative motion of a magnet and coil produces an induced potential difference which sets up an induced current in the circuit and it lasts so long the relative motion is there.
Momentary deflection will be there with increased magnitude.
It is a process by which a changing magnetic field in a conductor induces current in another conductor.
No deflection in galvanometer As there is no relative motion between the coil and magnet which leads to no change in magnetic field associated with coil hence no induced current generates.
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