When θ is 180 degree, alternating EMF will be

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Explanation: Given: An alternating EMF is given by the function of angle θ where θ = 180°.

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

Steps: Identify the standard EMF equation: The instantaneous value of an alternating EMF is determined by the sine wave equation where $E_m$ is the maximum amplitude and $	heta$ is the phase angle.. Substitute the given angle: Given $	heta = 180^\circ$, we substitute this value into the sine function.. Evaluate the sine function: We know from trigonometry that $\sin(180^\circ) = 0$.

Answer: A is correct because the sine of $180^\circ$ is $0$, which causes the entire instantaneous EMF expression to equal zero.

Exam Tip: Understanding the zero-crossing points (0°, 180°, 360°) is crucial for analyzing rectifier circuits and zero-voltage switching in power electronics.

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