A straight rod long carries a uniform positive linear charge density of

PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

A straight rod

20\,\text{cm}

long carries a uniform positive linear charge density of

4.0\,\mu\text{C m}^{-1}

. A point charge of

3.0\,\mu\text{C}

is placed on the line of the rod, at a distance

10\,\text{cm}

from the nearer end of the rod and outside it. Calculate the magnitude of the force on the point charge.

k = 9 \times 10^{9}\,\text{N m}^{2}\text{/C}^{2}

. (a)

1.44\,\text{N}

(b)

0.36\,\text{N}

(c)

0.72\,\text{N}

(d)

1.08\,\text{N}