In an induction coil, the current increases from zero to 6 amp in 0.3s by which induced emf of 30 V is produced in it. The value of coefficient of self induction of coil will be

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In an induction coil, the current increases from zero to 6 amp in 0.3s by which induced emf of 30 V is produced in it. The value of coefficient of self induction of coil will be