College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Three identical point charges, each of mass m = 0.100 kg, hang from three strings, as shown in Figure P15.68. If the lengths of the left and right strings are each L = 30.0 cm and if the angle θ is 45.0°, determine the value of q.


Figure P15.68

To determine

The value of q.


Given info: The mass of the charges is 0.100 kg. The length of the string is 30.0 cm.

The free body diagram is,

  • FE is the net electric force.
  • T is the tension.
  • m is the mass of the ball.
  • g is the acceleration due to gravity.

From the diagram,

Tcos45ο=mg (1)

Tsin45ο=FE (2)

Dividing the equation (2) by equation (1),


Formula to calculate the net electric force is,


  • ke is the Coulomb constant.
  • r1 and r2 are the distances of separation.
  • q is the charge.

The distances between the spheres are,




On Re-arranging,


Substitute 9

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