UPSC NDA I and II 2020 General Ability Solved Paper

The resistance of a wire depends directly on the length of a wire.
Thus if we reduce the length of a wire to half the resistance too will drop to half.
Thus now two pieces will have 10 ohm resistance each
Thus let equivalent resistance in parallel connection be Rq
Thus

1

Rq

=

1

10

+

1

10

⇒Rq=

10

2

=5‌ohm