JEE Main 2017 · 2 Apr · Shift 1 · Physics Q17

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PhysicsSingle correct+4 / -1Question 17 of 90

In the above circuit the current in each resistance is :

A ladder: top and bottom rails each carry three 2 V cells in series; three 1 Ω resistors join the rails at the rungs, with a closing wire at the left end.

1 A

0.25 A

0.5 A

0 A

Answer and worked solution

Official answer: D

In each loop of the ladder, the 2 V cell on the top rail and the 2 V cell on the bottom rail are traversed in opposite senses, so the net emf round every loop is zero. With no net emf in any loop the potentials at the two ends of each rung are equal, and no current flows through any 1 Ω resistor.

Topics:Kirchhoff's laws

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JEE Main 2017 · 2 Apr · Shift 1, Physics question 17