question_answer

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 \[=\frac{\sigma }{{{\varepsilon }_{0}}}\left( \frac{{{a}^{2}}}{c}-\frac{{{b}^{2}}}{c}+c \right)=\frac{\sigma }{{{\varepsilon }_{0}}}(2a)\,(\because c=a+b)\]. The induced emf in the loop when the radius is 2 cm is

A) \[{{V}_{A}}={{V}_{C}}\ne {{V}_{B}}\]

B)                        \[\therefore \]

C) \[{{v}_{S}}=v+{{v}_{B}}\]                             

D) \[=\frac{1000}{100}=10\,\text{m}{{\text{s}}^{-1}}\]