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Strength of Electrostatic Force

The electric ...

Question

The electric force on a charge $q_{1}$ due to $q_{2}$ is $(4 ˆ i - 3 ˆ j)$ N. What is the force on $q_{2}$ due to $q_{1}$ ?

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Solution

The force on $q_{2}$ due to $q_{1}$ will be equal and opposite to force on $q_{1}$ due to $q_{2}$ . (By Newton's third law)
Thus, the force on $q_{2}$ due to $q_{1}$ will be $[- (4^i - 3^j)] N$

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