Question

A sphere of radius 10 cm is charged to a potential of 500V. Calculate the outward pull per unit area.

Ans: 1390 * 10^-8 N/m^2
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I'm sure the calc is simple, but how do I calculate "outward pull" from voltage?

Answer 1

The pull per unit area is the E-field times the charge per unit area.

For total charge Q,
500 V = k Q/R
Solve for Q and then for pull per area.

Answer 2

Thank you so much