Question

A metallic square loop $ABCD$ is moving in its own plane with velocity $v$ in a uniform magnetic field perpendicular to its plane as shown in figure. An electric field is induced

• A. in $AD$, but not in $BC$
• B. in $BC$, but not in $AD$
• C. neither in $AD$ nor in $BC$
• D. in both $AD$ and $BC$

Answer 1

Answer: (D)

The square loop ABCD is a metallic loop. So it consists of the free electrons. When the loop moves in a magnetic field, the free electrons in the AD and BC rod will experience the Lorentz force and they will move towards the ends creating a potential difference in the rods. This induced emf leads to the electric field induced in the rods AD and BC of the square loop. But there will be no current flowing in the loop as ned potential difference is zero.