A current of 1.5 A flows through a solenoid of length 20.0 cm, cross-s – McqOptions

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1.	A current of 1.5 A flows through a solenoid of length 20.0 cm, cross-section \[20.0\text{ }c{{m}^{2}}\] and 400 turns. The current is suddenly switched off in a short time of 1.0 millisecond. Ignoring the variation in the magnetic field the ends, the average back emf induced in the solenoid is:
A.	0.3 V
B.	9.6 V
C.	30.0 V
D.	3.0 V
Answer» B. 9.6 V

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