A horizontal ring of radius \[r=1/2m\] is kept in a vertical constant – McqOptions

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1.	A horizontal ring of radius \[r=1/2m\] is kept in a vertical constant magnetic field 1 T. The ring is collapsed from maximum area to zero area in 1 s. Then the emf induced in the ring is
A.	\[1\,V\]
B.	\[(\pi /4)\,V\]
C.	\[(\pi /2)\,V\]
D.	\[\pi \,V\]
Answer» C. \[(\pi /2)\,V\]

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