The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs
A. 50
B. 20
C. 0.05
D. 500
Answer: Option B
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Becouse
V=Ldi/dt
And di/dt=V/L
So. di/dt=200/10
di/dt=20