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Q.

In the given circuit, the current flowing through the resistance 20  Ω is 0.3 A while the ammeter reads 0.8 A. What is the value of R1?

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a

30 ohms

b

40 ohms

c

50 ohms

d

60 ohms

answer is D.

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Detailed Solution

V=20 × 0.3 =6 VI2 = 615=0.4 AI=I1 +0.3 +I2⇒   0.8=I1 +0.3 +0.4⇒  I1 =0.1  A;  R1 =VI1 =60.1=  60  Ω
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In the given circuit, the current flowing through the resistance 20  Ω is 0.3 A while the ammeter reads 0.8 A. What is the value of R1?