Directions: In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
The magnetic flux linked with a coil is\[\phi \]and the emf induced in it is e. Then: (1) if\[\phi \ne 0,e\]cannot be 0 (2) if\[\phi =0,e\]must be 0 (3) if\[e\ne 0,\phi \]may not be zero (4) none of the above is correctA) 1 and 2 are correct
B) 2 and 3 are correct
C) 1 and 4 and correct
D) 1, 2 and 4 are correct
Correct Answer: B
Solution :
emf, \[e=\frac{d\phi }{dt}\] So, if \[\phi =0,e=0\] However, e can be zero, when\[\phi =0\]. If\[e\ne 0;\frac{d\phi }{dt}\ne 0,\phi \]may not be zero.
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