When θ is zero, alternating EMF will be

Question

Examoogle · Accepted Answer

Zero

Explanation: Given: The instantaneous alternating electromotive force (EMF) is defined as a function of the angle theta, where e = E_m sin(theta).

Formula Used: $$e = E_m \sin(	heta)$$

Steps: Identify the formula for alternating EMF: The instantaneous value of an alternating EMF produced by a rotating coil in a magnetic field is given by the sine function of the angle.. Substitute the given value: We are given that the angle $	heta$ is zero, so substitute $	heta = 0$ into the equation.. Calculate the result: Since the sine of zero degrees is zero, the resulting EMF is also zero.

Answer: A is correct because the instantaneous value of a sine wave at an angle of $0^\circ$ is always zero.

Exam Tip: This concept is fundamental to understanding the generation of AC voltage in alternators and transformers where the EMF is phase-shifted by $90^\circ$ relative to the magnetic flux.

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