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Q.

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

60 ohms

b

30 ohms

c

40 ohms

d

50 ohms

answer is D.

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Detailed Solution

In 20Ω→v=0.3×20=6v volt 
15Ω→i=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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