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Magnetism and Electromagnetism - Engineering

Q1:

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

A increase

B decrease

C remain constant

D be excessive

ANS:B - decrease

According to Faraday's 2nd law induced emf is directly proportional to the n*d(phi)/dt. So if n is decreased emf is decreased.