When two charges are equal q each, force they exert on each other is $F$ . When one of the charges is doubled, the $2$ q charge exerts a force $2 F$ on charge q. The force exerted by q on $2$ q is :

F

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\frac{F}{2}

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\frac{F}{4}

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2 F

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Solution

The correct option is C $2 F$
Electrostatic force is mutual. Force exerted on charge $q$ due to charge $2 q$ is equal to the force exerted on $2 q$ due to charge $q$ . So, if $2 q$ charge exerts a force $2 F$ on charge $q$ , then the force exerted by $q$ on $2 q$ is also $2 F$ .
Ans:(D)

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When two charges are equal q each, force they exert on each other is F. When one of the charges is doubled, the 2q charge exerts a force 2F on charge q. The force exerted by q on 2q is :

The correct option is C 2FElectrostatic force is mutual. Force exerted on charge q due to charge 2q is equal to the force exerted on 2q due to charge q. So, if 2q charge exerts a force 2F on charge q, then the force exerted by q on 2q is also 2F.Ans:(D)

When two charges are equal q each, force they exert on each other is $F$ . When one of the charges is doubled, the $2$ q charge exerts a force $2 F$ on charge q. The force exerted by q on $2$ q is :

The correct option is C $2 F$
Electrostatic force is mutual. Force exerted on charge $q$ due to charge $2 q$ is equal to the force exerted on $2 q$ due to charge $q$ . So, if $2 q$ charge exerts a force $2 F$ on charge $q$ , then the force exerted by $q$ on $2 q$ is also $2 F$ .
Ans:(D)