Question

In an electricity experiment, a 1.10 g plastic ball is suspended on a 56.0 cm long string and given an electric charge. A charged rod brought near the ball exerts a horizontal electrical force F elec on it, causing the ball to swing out to a 21.0 degree angle and remain there.

What is the tension in the string?

Answer 1

Tension, T = 0.0115 N

Step-by-step explanation:

Given that,

Mass of the plastic ball, m = 1.1 g

Length of the string, l = 56 cm

A charged rod brought near the ball exerts a horizontal electrical force F on it, causing the ball to swing out to a 21.0 degree angle and remain there. According to attached figure :

`T\cos\theta=mg`

T is tension in the string

`T=(mg)/(\cos\theta)\\\\T=(1.1* 10^(-3)* 9.8)/(\cos(21))\\\\T=0.0115\ N`

So, the tension in the string is 0.0115 N.