Q6. A solenoid of 850 turns per meter and area 0.017 m² has a current drop from 10 A to 7 A in 0.25 s. What is the self-induced emf? (\( \mu_0 = 4\pi \times 10^{-7} \, \text{H/m} \))
- A. 0.15 V
- B. 0.185 V
- C. 0.2 V
- D. 0.22 V
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