A square loop of side 20 cm and resistance $1 \Omega$ is moved towards right with a constant speed $v _ { 0 }$. The right arm of the loop is in a uniform magnetic field of 5 T. The field is perpendicular to the plane of the loop and is going into it. The loop is connected to a network of resistors each of value $4 \Omega$. What should be the value of $v _ { 0 }$ so that a steady current of 2 mA flows in the loop? (1) $10 ^ { - 2 } \mathrm {~cm} \mathrm {~s} ^ { - 1 }$ (2) $1 \mathrm {~m} \mathrm {~s} ^ { - 1 }$ (3) $1 \mathrm {~cm} \mathrm {~s} ^ { - 1 }$ (4) $10 ^ { 2 } \mathrm {~m} \mathrm {~s} ^ { - 1 }$
A square loop of side 20 cm and resistance $1 \Omega$ is moved towards right with a constant speed $v _ { 0 }$. The right arm of the loop is in a uniform magnetic field of 5 T. The field is perpendicular to the plane of the loop and is going into it. The loop is connected to a network of resistors each of value $4 \Omega$. What should be the value of $v _ { 0 }$ so that a steady current of 2 mA flows in the loop?\\
(1) $10 ^ { - 2 } \mathrm {~cm} \mathrm {~s} ^ { - 1 }$\\
(2) $1 \mathrm {~m} \mathrm {~s} ^ { - 1 }$\\
(3) $1 \mathrm {~cm} \mathrm {~s} ^ { - 1 }$\\
(4) $10 ^ { 2 } \mathrm {~m} \mathrm {~s} ^ { - 1 }$