Answer :

Using V=IR where V is Voltage; I is the current and R is the resistance, the current that will pass is 0.5 Ampere.

Since resistance is directly proportional to length, if the length is halved then resistance will be halved; hence new resistance will be 6Ω.

Now, the potential difference is doubled i.e. 12V; So now the current changes to 2 Ampere.

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