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In the given circuit current flowing thr...

In the given circuit current flowing through the resistance `20Omega` is `0.3A,` while the ammeter reads 0.8 A. What is the value of `R_1`

A

`30 Omega`

B

`40 Omega`

C

`50 Omega`

D

`60 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
`V_(20Omega)=V_(Total)`
`:. (20)(0.3)=(R_(Total))(0.8)`
`: R_(Total)=30/4Omega`
`:. 4/30=1/R_1+1/20+1/15`
Solving we get `R_1=60Omega`
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