Two magnetic fields exits in the two regions as shown in . A loop abcd of `40 xx 10 cm` id placed in the field. The resistance per unit length of the loop is `r = 2Omegacm^(-1)`. All of a sudden, the loop is given a velocity `v_(0) = 20cm s^(-1)` towards roght. What is the potential difference `V_(c ) - V_(b)` ?