NEET 2024 — Physics solution

NEET2024Physics

A bob is whirled in a horizontal plane by means of a string with an initial speed of $ω$ rpm. The tension in the string is $T$ . If speed becomes $2 ω$ while keeping the same radius, the tension in the string becomes:

A
$\frac{T}{4}$
B
$2 T$
C
$T$
D
$4 T$

Solution

Tension provides the centripetal force: $T = m r ω^{2}$ .

Since $T \propto ω^{2}$ (with $r$ unchanged), doubling $ω$ quadruples the tension.

$∴ T^{'} = 4 T$ .

← Back to full paper

Practice more Physics

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →