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 \(11\ \Omega\)?
- A \(0.9\ \text{mA}\)
- B \(0.09\ \text{mA}\)
- C \(9\ \text{mA}\)
- D \(90\ \text{mA}\)
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:…
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