A) \[4{{E}_{n}}\]
B) \[{{E}_{n}}/4\]
C) \[2{{E}_{n}}\]
D) \[{{E}_{n}}/2\]
Correct Answer: D
Solution :
From Faradays law of electromagnetic induction, when the magnetic flux through a circuit is changing an induced emf (e) is set up in the circuit whose magnitude is equal to the negative rate of change of magnetic flux \[f=\frac{v}{v+{{v}_{s}}}\,\,f\] \[=\frac{320}{320+4}\times 240\] Given, \[=237Hz\] \[=f-f=\] \[\Rightarrow \] \[n=243-237=6\] Note: The direction of induced emf is such as to oppose the change that produced it.You need to login to perform this action.
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