A solenoid has 2000 turns wound over a length of 0.30 m. Its area of cross-section is 1.2 × 10 –3 m 2 . Around its central section a coil of 300 turns is wound. If an initial current of 2A in the solenoid is reversed in 0.25 sec, the emf induced in the coil is equal to -
Text Solution
Verified by ExpertsThe correct answer is:
B
Magnetic field of solenoid, 
Magnet flux of coil, 
As 
, so 
induced emf, 
or 
Volt
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