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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

`8 Omega`

B

`6 Omega`

C

`10 Omega`

D

`4 Omega`.

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