JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · Current Electricity

For the resistance network shown in the figure, choose the correct option(s).

(A)The current through $P Q$ is zero.✓ Correct
(B) $I_{1} = 3 A$ .✓ Correct
(C)The potential at $S$ is less than that at $Q$ .✓ Correct
(D) $I_{2} = 2 A$ .✓ Correct

Answer: (A), (B), (C), (D)

Solution

The network forms a Wheatstone bridge with nodes

P

and

Q

equipotential, and nodes

S

and

T

equipotential. No current flows through

P Q

S T

. The current

I_{1} = \frac{12}{4} = 3

A. The current

I_{2} = I_{1} \times \frac{12}{6 + 12} = 3 \times \frac{12}{18} = 2

A. The potential at

S

is less than at

Q

due to the voltage drop. All options are correct.

JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · One or more correct options

Practise more: all JEE Advanced PYQs on Current Electricity →

More JEE Advanced questions on Current Electricity

A metal wire of cross-sectional area $0.5 mm^{2}$ and length 100 m is connected across a battery of e.m.f. 2 V and internal resistance $1Ω$ . The density, atomic mass and electrical conductivity of the metal are …
JEE Advanced 2026View solution →
As shown in the figure, the resistance of a galvanometer $G$ can be found by the half-deflection method. Here the resistance $R_{2}$ is adjusted such that when the key $K$ is closed the deflection in the galvanometer becomes half of the value as compared to when $K$ is op …
JEE Advanced 2026View solution →
In a circuit shown in the figure, the capacitor $C$ is initially uncharged and the key $K$ is open. In this condition, a current of 1 A flows through the $1Ω$ resistor. The key is closed at time $t = t_{0}$ . Which of the following statement(s) is(are) correct?
[Given: …
JEE Advanced 2023View solution →
The figure shows a circuit having eight resistances of $1Ω$ each, labelled $R_{1}$ to $R_{8}$ , and two ideal batteries with voltages $ε_{1} = 12 V$ and $ε_{2} = 6 V$ .

Which of the following statement(s) is(are) correct?
JEE Advanced 2022View solution →
Two resistances $R_{1} = X Ω$ and $R_{2} = 1Ω$ are connected to a wire $A B$ of uniform resistivity, as shown in the figure. The radius of the wire varies linearly along its axis from $0.2 mm$ at $A$ to $1 mm$ at $B$ . A galvanometer (G) connected to the center …
JEE Advanced 2022View solution →
In Circuit-1 and Circuit-2 shown in the figures, $R_{1} = 1Ω, R_{2} = 2Ω$ and $R_{3} = 3Ω$ . $P_{1}$ and $P_{2}$ are the power dissipations in Circuit-1 and Circuit-2 when the switches $S_{1}$ and $S_{2}$ are in open conditions, respectively.
$Q_{1}$ and …
JEE Advanced 2022View solution →