MHT CET 2024 Physics question
When 80 volt d.c. is applied across a solenoid, a current of 0.8 A flows in it. When 80 volt a.c. is applied across the same solenoid, the current becomes 0.4 A. If the frequency of a.c. source is 50 Hz, the impedance and inductance of the solenoid is nearly
Answer: (A)
Solution
With d.c. only the resistance limits the current: . With a.c., impedance . Since , . Then \dfrac{X_L}${2π
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