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College Physics

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

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College Physics

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

The three charges in Figure P16.17 are at the vertices of an isosceles triangle. Let q = 7.00 nC and calculate the electric potential at the midpoint of the base.

images

Figure P16.17

To determine
The potential at the midpoint.

Explanation

Formula to calculate the potential is,

V=keqr+keqr+keq+r+

  • ke is the Coulomb constant.
  • r and r+ is the distance between the charges q and q+ and the midpoint.

The between the q+ and the midpoint is,

r+=(4.00cm)2(1.00cm)2=3.87cm

Substitute 7.00 nC for q+ , -7.00 nC for q , 1.00 cm for r , 3.87 cm for r+ and 8.99×109 Nm2C2 for ke .

V=(8.99×109 Nm2C2){(7

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