Q. 25

Expert-verifiedFound in: Page 684

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

The electric field strength just above one face of a copper penny is . What is the surface charge density on this face of the penny?

The surface charge density on this face of the penny is

__Given__ :

Electric field strength :

__Theory used__ :

The electric field inside a conductor is zero at all times when it is in electrostatic equilibrium. However, all surplus charges on the conductor accumulate on the outside surface, and as further charges are added, they spread out on the outer surface until they reach the electrostatic equilibrium points.

The electric field at the surface of a charged conductor is given by the equation (1)

where is the surface charge density, which is a physical parameter that relies on the conductor's form.

We will calculate the surface charge density using the electric field outside the conductor. Rearranging equation (1) for , we get :

(2)

We now input the values for into equation (2) to get

94% of StudySmarter users get better grades.

Sign up for free