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

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a
30 ohms
b
40 ohms
c
50 ohms
d
60 ohms

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detailed solution

Correct option is D

In 20Ωv=0.3×20=6v volt 
15Ωi=VR=615=0.4A

Current through R1 is = 0.8-0.3-0.4=0.1A

R1=Vi1=60.1=60Ω

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