Current Electricity and Electrical InstrumentHard
Question
In the circuit shown in figure, A is a sliding contact which can move over a smooth rod PQ. Resistance per unit length of the rod PQ is 1 ohm/m. Initially slider is just left to the point P and circuit is in the steady state. At t = 0 slider starts moving with constant velocity v = 5 m/s towards right. Current in the circuit at t = 2 sec is :-
Options
A.1 amp
B.less than 0.5 amp
C.more than 1 amp
D.in between 0.5 to 1.0 amp
Solution
30 - L 
= i (20 + 5t)
∵
= - ve
⇒ 30 - L
> 30
⇒ at t = 2sec ; i > 1 amp
= i (20 + 5t) ∵
= - ve⇒ 30 - L
> 30 ⇒ at t = 2sec ; i > 1 amp
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