Electric Potential and Energy Quiz

The SI unit of work done by an electric field is:

• Joule

• Newton

• Coulomb

• Volt

A charge q moves in a uniform electric field. The work done by the field is:

• W = qEd cos(theta)

• W = qE/d

• W = q/E

• W = Ed/q

The potential energy of a system of two point charges q1 and q2 separated by distance r is:

• U = k(q1q2)/r

• U = k(q1q2)/r^2

• U = kq1q2r

• U = k(q1+q2)/r

The electric field due to a point charge is given by:

• E = kq/r^2

• E = kq/r

• E = kq^2/r^2

• E = kqr

The potential energy of a charge in an electric field is highest when:

• It is farthest from the charge creating the field

• It is closest to the charge creating the field

• It is in motion

• It is at an equipotential surface

The work done by an electric field on a charge is given by:

• W = qE(dy)

• W = qE/y

• W = q/E

• W = E/q

If work is done by the electric field, the potential energy of the charge:

• Decreases

• Increases

• Remains constant

• Is zero

When a charge moves in the direction of the electric field:

• Work done by the field is positive and potential energy decreases

• Work done by the field is negative and potential energy increases

• Work done by the field is positive and potential energy increases

• Work done by the field is zero

The electric potential at a point due to a point charge q is given by:

• V = kq/r

• V = kq/r^2

• V = kq^2/r

• V = kqr

The unit of electric potential is:

• Volt (V)

• Newton (N)

• Coulomb (C)

• Joule (J)