Test Index

VITEEE 2017 Paper

Section: Physics

Question : 20 of 125

Marks: +1, -0

Resistances 1 Ω, 2Ω and 3 Ω are connected to form a triangle. If a 1.5 V cell of negligible internal resistance is connected across the 3 Ω resistor, the current flowing through this resistor will be

0.25 A
0.5 A
1.0 A
1.5 A

Validate

Solution:

Equivalent resistance between A and B = series combination of 1 Ω and 2 Ω in parallel with 3 Ω resistor..

\frac{1}{R}

\frac{1}{3}+\frac{1}{3}

\frac{2}{3}

or R = 1.5 Ω

∴ Current in the circuit is I = V/R = 1.5/1.5 = 1A.

Since the resistance in arm ACB = resistance in arm AB = 3 Ω, the current divides equally in the two arms. Hence the current through the 3 Ω resistor = 1/2 = 0.5 A.

Go to Question:

Prev Question

Next Question