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Question: Current is induced in coil C_{1} due to motion of the current carrying coil C_{2}.In Fig. the bar magnet is replaced by a second coil mathrm{C}_{2} connected to a battery. The steady current in the coil mathrm{C}_{2} produces a steady magnetic field. As coil mathrm{C}_{2} is moved towards the coil C_{1}, the galvanometer shows a deflection. This indicates that electric current is induced in coil mathrm{C}_{1}. When mathrm{C}_{2} is moved away, the galvanometer shows a deflection again, but this time in the opposite direction. The deflection lasts as long as coil mathrm{C}_{2} is in motion. When the coil mathrm{C}_{2} is held fixed and mathrm{C}_{1} is moved, the same effects are observed. Again, it is the relative motion between the coils that induces the electric current.What would you do to obtain a large deflection of the galvanometer?How would you demonstrate the presence of an induced current in the absence of a galvanometer?
Current is induced in coil \(C_{1}\) due to motion of the current carrying coil \(C_{2}\).
In Fig. the bar magnet is replaced by a second coil \(\mathrm{C}_{2}\) connected to a battery. The steady current in the coil \(\mathrm{C}_{2}\) produces a steady magnetic field. As coil \(\mathrm{C}_{2}\) is moved towards the coil \(C_{1}\), the galvanometer shows a deflection. This indicates that electric current is induced in coil \(\mathrm{C}_{1}\). When \(\mathrm{C}_{2}\) is moved away, the galvanometer shows a deflection again, but this time in the opposite direction. The deflection lasts as long as coil \(\mathrm{C}_{2}\) is in motion. When the coil \(\mathrm{C}_{2}\) is held fixed and \(\mathrm{C}_{1}\) is moved, the same effects are observed. Again, it is the relative motion between the coils that induces the electric current.
What would you do to obtain a large deflection of the galvanometer?
How would you demonstrate the presence of an induced current in the absence of a galvanometer?

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Solution

To get large deflection in the galvanometer, one can
\((i) \) Increase the relative speed between \(C_1\) and \(C_2\)
\((ii)\) Increase the number of turns of coil \(C_1\)
\((iii)\) Insert  the medium of greater relative permeability to enhance the magnetic field inside the coil \(C_1\)
⟹ We can use either a motor or connect a light source like ordinary bulb. So due to phenomenon  of electromagnetic induction, the glow of bulb or movement of rotor will indicate the presence of induced current in the circuit.
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