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Q.

In the shown circuit reading of ideal AC voltmeter V1 and V3 are 300 volt each then choose correct option/options if reading of ammeter is 10A:

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a

V2 = 300 V

b

V2 = 400 V

c

R=10Ω

d

R=20Ω

answer is B, D.

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Detailed Solution

V1=IXL2+R2      XL2+R2=V1I=30010=30 Ω      (i)

Similarly, XC2+R2=V2I=30010=30 Ω      (ii).

From (i) and (ii),  XL=XC.

Hence, Vsupply=VL+VR+VR+VC=2VR    XL=XC,  VL+VC=0.

Therefore, V2=2VR=Vsupply=400 V.

Also, 2IR=V2      R=V22I=4002×10=20 Ω.

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In the shown circuit reading of ideal AC voltmeter V1 and V3 are 300 volt each then choose correct option/options if reading of ammeter is 10A: