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COMEDK · Physics · 22. Electromagnetic Induction

A circular coil of radius 7 cm and 40 turns is rotated about its vertical diameter with an angular speed of 40 radians per second in a uniform horizontal magnetic field of \(4 \times 10^{-2}\ T\). What is the maximum current induced in the coil if the resistance of the coil is \(11\ \Omega\)?

  1. A \(0.9\ \text{mA}\)
  2. B \(0.09\ \text{mA}\)
  3. C \(9\ \text{mA}\)
  4. D \(90\ \text{mA}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(90\ \text{mA}\)

Step-by-step Solution

Detailed explanation

Given: Number of turns, \(N = 40\) Radius of the coil, \(r = 7\ \text{cm} = 0.07\ \text{m}\) Angular speed, \(\omega = 40\ \text{rad/s}\) Magnetic field, \(B = 4 \times 10^{-2}\ \text{T}\) Resistance, \(R = 11\ \Omega\) The maximum induced emf in the coil is given by:…