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Q.

Graph shows variation of source emf V and current i in a series RLC circuit, with time.

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a

The current leads the emf in the circuit

b

To increase the rate at which energy is transferred to the resistive load, L should be increased

c

The circuit is more inductive than capacitive

d

To increase the rate at which energy is transferred to the resistive load, L should be decreased

answer is B, C.

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Detailed Solution

 It is apparant from the graph that emf attains its maximum value before the current does, therefore current lags behind emf in the circuit. Nature of the circuit is inductive. Value of power factor cos ϕ increases by either decreasing L of increasing C.
 

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