Two balls with charges +7 mu C and -5 mu C | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Initially,the charges are $q_1 = +7 \ \mu C$ and $q_2 = -5 \ \mu C$. The force between them is given by Coulomb's Law: $F = k \frac{|q_1 q_2|}{r^2

Vedclass · Accepted Answer

$F$

Vedclass · Answer

(A) Initially,the charges are $q_1 = +7 \ \mu C$ and $q_2 = -5 \ \mu C$. The force between them is given by Coulomb's Law: $F = k \frac{|q_1 q_2|}{r^2} = k \frac{|(7 	imes 10^{-6})(-5 	imes 10^{-6})|}{r^2} = k \frac{35 	imes 10^{-12}}{r^2}$.After adding $-2 \ \mu C$ to both,the new charges are:$q_1' = 7 \ \mu C - 2 \ \mu C = +5 \ \mu C$$q_2' = -5 \ \mu C - 2 \ \mu C = -7 \ \mu C$.The new force $F'$ is:$F' = k \frac{|q_1' q_2'|}{r^2} = k \frac{|(5 	imes 10^{-6})(-7 	imes 10^{-6})|}{r^2} = k \frac{35 	imes 10^{-12}}{r^2}$.Comparing the two expressions,we see that $F' = F$.

Two balls with charges $+7 \ \mu C$ and $-5 \ \mu C$ attract each other with a force $F$. If $-2 \ \mu C$ charge is added to both,what will be the force between them?

Similar Questions

According to Coulomb's Law,which is the correct relation for the following diagram?

Two charges $2 C$ and $6 C$ are separated by a finite distance. If a charge of $-4 C$ is added to each of them, the initial force of $12 \times 10^3 \,N$ will change to

Three charges of equal magnitude are placed at three corners of a square of side $a$. If $F_{12}$ is the force between the charges at corners $1$ and $2$,and $F_{13}$ is the force between the charges at corners $1$ and $3$,what is the ratio $F_{12}/F_{13}$?

Two identical spheres have charges $+q$ and $-q$ and are placed at a certain distance. The force between them is $F$. If a third identical sphere with charge $+q$ is placed exactly between the two spheres, what is the magnitude and direction of the force experienced by it?

Vedclass Test Series

Exam Paper Generator

Online Exam Module