Two identical small insulating spheres

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

Two identical small insulating spheres, each of mass

5\,\text{g}

, carry equal positive charges of

0.40\,\mu\text{C}

. They are suspended from a common point by two light threads of length

50\,\text{cm}

. In equilibrium the centres of the spheres are

30\,\text{cm}

apart. Neglecting the mass of the threads, the tension in each thread is closest to (a)

0.061\,\text{N}

(b)

0.049\,\text{N}

(c)

0.051\,\text{N}

(d)

0.016\,\text{N}