The resistance that must be connected in series with inductance of 0.2 H in order that the phase difference between current and e.m.f. may be 45°when the frequency is 50 Hz, is_________
A. 6.28 ohm.
B. 62.8 ohm.
C. 628 ohm.
D. 31.4 ohm.
Answer:B
The resistance that must be connected in series with inductance of 0.2 H in order that the phase difference between current and e.m.f. may be 45°when the frequency is 50 Hz, is_________
A. 6.28 ohm. B. 62.8 ohm. C. 628 ohm. D. 31.4 ohm.