First slide

Electrostatic force

Question

Two identical simple pendulums, A and B, are suspended from the same point. The bobs are given positive charges, with A having more charge than B. They diverge and reach equilibrium, with A and B making angles $θ$ ₁ and $θ$ ₂ with the vertical respectively. Which of the following is correct?

Moderate

A

$θ_{1} > θ_{2}$
B

$θ_{1} < θ_{2}$
C

$θ_{1} = θ_{2}$
D

The tension in A is greater than that in B

Solution

Coulomb forces $(F_{e})$ between unequal charges are equal.
For equilibrium,
$F o r A : \tan θ_{1} = \frac{F_{e}}{m g} F o r B : \tan θ_{2} = \frac{F_{e}}{m g} C o m p a r i n g, w e g e t \tan θ_{1} = \tan θ_{2} \Rightarrow θ_{1} = θ_{2}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App