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The voltage is reduced by a factor of 2.

Explanation:

According to the OHM's law, Voltage is directly proportional to the resistance keeping the current constant

           Voltage = Current × resistance

                       V = I × R

when I is constant,   V ∝ R

It can be seen that by keeping the current constant, as we halved the resistance, voltage will be halved.

For Example

Consider,     I = 10 A             R = 10Ω

then             V = I × R = 10 × 10 = 100 V

Keeping current constant and by halving the resistance i.e R = 5Ω

                    V = I × R = 10 × 5 = 50 V

Hence, resistance in a circuit is halved, Voltage will be halved.