English Physicist, Michael Faraday, in 1831, made an important breakthrough by discovering how a moving magnet can be used to generate electric currents.
He took a coil of wire having a large number of turns and connected the ends of the coil to a galvanometer. He took a strong bar magnet and moved its north pole towards one end of the coil.
1. A galvanometer is a device that can detect the:
(a) Potential difference across two ends.
(b) Amount of electric current
(c) Resistance of the conducting wire.
(d) Direction of the electric current.
2. When the bar magnet is moved towards one end of the coil, what happens to the needle of the galvanometer.
(a) It deflects towards right.
(b) It deflects towards left.
(c) It does not show any deflection.
(d) It first moves to the right and then to the left.
3. What happen to the needle of the galvanometer, when the bar magnet is kept stationary with respect to the magnet.
(a) It deflects towards right.
(b) It deflects towards left.
(c) It deflection drops to zero.
(d) It first moves to the right and then to the left.
4.What happen to the needle of the galvanometer, when the north pole of the bar magnet is withdrawn away from the coil.
(a) It deflects towards right.
(b) It deflects towards left.
(c) It deflection drops to zero.
(d) It first moves to the right and then to the left.
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Explanation:
Q1 ) (b) amount of electric current.
Q2) (a) it deflects towards right.
Q3) (c) it does not show any deflection.
Q4) (a It deflects towards right.
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