JEE Main 2003 Physics question

When the current changes from +2 A to −2 A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is

• (1)0.2H
• (2)0.4H
• (3)0.8H
• (4)0.1HCorrect