A) \[\varepsilon \] must be zero if \[\phi =0\] and changing
B) \[\varepsilon \ne 0\] and \[\phi =0\]
C) \[\varepsilon =0\] then \[\phi \] must be zero
D) \[\varepsilon \ne 0\] if \[\phi \] is changing
Correct Answer: D
Solution :
(d) \[\varepsilon \ne 0\] if \[\phi \] is changing We know that, \[\varepsilon =-\frac{d\phi }{dt}\Rightarrow \varepsilon =0\] only if \[\frac{d\phi }{dt}=0\] if \[\varepsilon =0,\] then \[\phi =\] constant \[\therefore \varepsilon \ne 0,\] then \[\phi \] is changing
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