A coil of inductance 0.20 H is connected in series with a switch and a cell of emf 1.6 V. The total resistance of the circuit is 4.0 W. What is the initial rate of growth of the current when the switch is closed?
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a
0.050 A/sec
b
0.40 A/sec
c
0.13 A/sec
d
8.0 A/sec
answer is D.
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Detailed Solution
V=RI+LdIdt, at t=0,I=0, thus we have⇒dI/dt=V/L=1.6/0.2=8A/s
A coil of inductance 0.20 H is connected in series with a switch and a cell of emf 1.6 V. The total resistance of the circuit is 4.0 W. What is the initial rate of growth of the current when the switch is closed?