Physics

Problem

A charge

q_2 = +2\,\mu\text{C}

is kept at the point

(4,5)\,\text{cm}

. Another point charge

q_1 = 3\,\mu\text{C}

of unknown sign is placed at

(1,1)\,\text{cm}

. The electrostatic force on

q_2

is measured to be

\mathbf F_{12}=(-6\,\hat i-8\,\hat j)\times10^{-3}\,\text{N}

. Which of the following statements is correct? a)

q_1

is positive and the force is repulsive b)

q_1

is positive and the force is attractive c)

q_1

is negative and the force is repulsive d)

q_1

is negative and the force is attractive