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Science · 2022 · 4 marks
CBSE 2022 · Region 4 · Set 3 · 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)
What is a galvanometer ? Why does its needle deflects when magnet is moved towards the coil to which it is connected ?
(b)
What would be observed in the galvanometer in a situation when the coil and the bar magnet both move with the same speed in the same direction? Justify your answer.
(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 an instrument that can detect the presence of a current in a circuit.
Induced current that flows in the coil and the galvanometer.
(b) There would be no deflection in the galvanometer because there is no induced current flowing in galvanometer as there is no relative motion between the magnet and the coil and no change in magnetic field associated with coil.
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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