Discussion
What is the value of induced EMF in a conductor of length 150 cm, moving at an angle of \(30^\circ\) to the direction of uniform magnetic field of flux density 1.2 wb/m\(^2\) with a velocity of 60 m/s?
Answer: A
The EMF induced in a conductor moving in a magnetic field is \(e = Blv\sin\theta\).
\[ \begin{aligned} e = 1.2 \times 1.5 \times 60 \times \sin 30^\circ \\ &= 108 \times 0.5 = 54\ \text{V} \end{aligned} \]
The length must be changed to 1.5 m. The value 60 V would result from taking \(\sin\theta = 0.555\), 45 V from a length of 1.25 m and 52 V has no basis. The answer is 54 V, option A.
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