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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30 ohms

40 ohms

50 ohms

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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