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The inductance of a coil is 60μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 second. The magnitude of the induced e.m.f. is 

(1) 60 × 10–6 V

(2) 300 × 10–4 V

(3) 30 × 10–4 V

(4) 3 × 10–4 V