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

Two point charges of equal magnitude but opposite sign are placed at a certain distance. The force between them is $F$. If $75\%$ of the charge from one is transferred to the other,what will be the new force between them?

Two charges $+q$ and $-3q$ are placed on the $x$-axis separated by a distance $d$. ($-3q$ is to the right of $q$). Where should a third charge $2q$ be placed such that it will not experience any net force?

Three charges $4q, Q$ and $q$ are placed at positions $0, \frac{l}{2}$ and $l$ respectively along a straight line. If the resultant force on $q$ is zero,then $Q$ is equal to

$A$ charge $q_1$ exerts some force on a second charge $q_2$. If a third charge $q_3$ is brought near,the force of $q_1$ exerted on $q_2$:

If two particles $A$ and $B$ of charges $1.6 \times 10^{-19} \ C$ and $3.2 \times 10^{-19} \ C$ respectively are separated by a distance of $3 \ cm$ in air,then the magnitude of electrostatic force on particle $A$ due to particle $B$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module