Potential difference between the points P and Q in the electric circuit shown is 

(1) 4.5 V

(2) 1.2 V

(3) 2.4 V

(4) 2.88 V

(4) Equivalent resistance between P and Q

1RPQ=1(6+2)+13+1(4+12)RPQ=4825Ω

Current between P and Q; i = 1.5A

So, potential difference between P and Q

VPQ=1.5×4825=2.88V

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