BITSAT 2006 Solved Question Paper

Given circuit is a balanced Wheatstone bridge.
So, diagonal resistance of 2Ω will be ineffective. Equivalent resistance of upper arms
=2+2=4Ω
Equivalent resistance of lower arms
=2+2=4Ω

Equivalent resistance of parallel combination ‌

1

RAB

=‌

1

4

+‌

1

2

+‌

1

4

⇒RAB=1Ω