An electric circuit consists of a variable resistor connected to a source of constant

The correct option is a) halved

Therefore,

Current through the resistor will be halved i.e

Explanation:

Given:

V = Voltage potential Difference constant

R' = 2R

To Find:

Current, I' = ? when R' = 2R

Solution:

Ohm's law:

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Ohm's law given as

Substituting the R' = 2R , new current we get

Therefore,

Current through the resistor will be halved i.e

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B