(B)→(Q), (S) A rotating (accelerated) charge creates a magnetic field. There is also a magnetic movement, namely,
→
m
= i
→
A
associated with it. (C)→(Q), (S)
µ0ia2
2(a2+x2)
3
2
→
m
= i0
→
A
(D)→(Q), (R), (S) Time-varying current creates a time-varying field. Hence, the magnetic flux also varies with time, which creates induced emf (induced