state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Physics Electromagnetic Induction and Inductance Mutual Induction
A solenoid has 2000 turns wound over a length of 0.30 meter. The area of its cross-section is 1.2 × 10−3m2. Around its central section, a coil of 300 turns is wound. If an initial current of 2 A in the solenoid is reversed in 0.25 sec, then the e.m.f. induced in the coil is
1
6 × 10−4 V
2
4.8 × 10−3 V
3
6 × 10−2 V
4
48 mV
5
Question Not Attempted