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Q.

An alternating current of frequency 'f '  is flowing in a circuit containing a resistance R and a choke L in series. The impedance of this circuit is

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a

R+ 2πfL

b

R2+4π2f2L2

c

R2+L2

d

R2+2πfL

answer is B.

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Detailed Solution

Z=R2+XL2,  XL=ωL and ω=2πf∴Z=R2+4π2f2L2
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An alternating current of frequency 'f '  is flowing in a circuit containing a resistance R and a choke L in series. The impedance of this circuit is