Question

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Answer 1

when key is open there is a momentary deflection in Galvanometer in coil 2 when key is closed there is also momentary deflection in the Galvanometer in the coil 2

but when the steady current is flowing through the circuit there is no deflection
Because when key is open the magnetic field around a coil 1 is changed and the magnetic around the coin 2 also changed so the changing magnetic field induced some current current induced the Galvanometer show deflection
similarly when coil is closed there is a magnetic field in coil 2 so the Galvanometer show deflection

Answer 2

(a) When the key is turned on, the reading in the galvanometer changes and then it instantaneously falls back to zero.

(b) When key is opened, the galvanometer's reading changes in the opposite direction and then falls back to zero.