Question

A point charge \[+q\] is at the origin \[O\], and a unit positive test charge is placed at a distance \[x\] from \[O\]. The electrostatic force on this test charge acts:

Options

• Tangentially, perpendicular to the line \[OP\]

• Radially outward (away from \[+q\]

• Radially inward, toward the charge \[+q\]

• The net force on the test charge is zero

Answer 1

The electrostatic force on a unit positive charge at distance \[x\] is \[F=\frac{1}{4\pi\varepsilon_0}\frac{q}{x^2}\], and its direction is radially outward (away from \[+q\]). Since both charges are positive, they repel each other.