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The current in a simple series circuit i...

The current in a simple series circuit is 5.0 amp . When an additional resistance of 2.0 ohms is inserted, the current drops to 4.0 amp . The original resistance of the circuit in ohms was

A

1.25

B

8

C

10

D

20

Text Solution

Verified by Experts

The correct Answer is:
B
`V = 5R`
`I = (5R)/(R + 2)`
`rArr 4R + 8 = 5R rArr R = 8`
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