Two coils A and B are wound on a non- conducting cylindrical rod. Initially the key is
inserted in the circuit in coil A. We find the galvanometer needle connected with coil B shows deflection. Later the key is removed and the galvanometer shows deflection in the opposite side.
a) What is the name of the coils A and B?
b) Describe in brief the phenomena which bring deflection in the galvanometer needle
in coil B?
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a) electromagnet
b) electromagnetic induction
Electromagnetic Induction was discovered by Michael Faraday in 1831 and James Clerk Maxwell mathematically described it as Faraday’s law of induction.
This either happens when a conductor is placed in a moving magnetic field (when using AC power source) or when a conductor is constantly moving in a stationary magnetic field.
Michael Faraday arranged a conducting wire as per the setup given below, attached to a device to measure the voltage across the circuit. When a bar magnet was moved through the coiling, the voltage detector measures the voltage in the circuit.
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