Electrostatic Potential and Capacitance Test

Result

Electrostatic Potential and Capacitance Test - 7

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Question 1
1 / -0

An equipotential surface is a surface on which the potential has

A
work done is positive in moving a charge from one point to another

B
positive value at every point

C
negative value at every point

D
the same value at every point

Solution

When the potential at all points on the surface is the same; such a surface is called an equipotential surface. The potential difference between any two points on an equipotential surface is zero, while the potential may be positive, negative or even zero.
Question 2
1 / -0

Which of the following is true about equipotential lines. Electric field lines are

A
tangential to equipotential lines

B
parallel to equipotential lines

C
opposite to equipotential lines

D
perpendicular to equipotential lines

Solution

The potential at all points on an equipotential surface is constant and work done in moving a charge on an equipotential surface is zero. Electric field lines show the direction of the electric field at the point. If the electric field lines were tangential, parallel or opposite to the equipotential surface, a tangential field will exist on the surface and work done in moving a charge on the surface is not zero. Therefore electric field lines are always perpendicular to the equipotential surface.
Question 3
1 / -0

At the surface of a charged conductor, electrostatic field must be

A
never normal to the surface at every point

B
parallel to the surface at every point

C
tangential to the surface at every point

D
normal to the surface at every point

Solution

Under static conditions, no current exists on the surface of a conductor. If the electric field at its surface is tangential or parallel to the surface, the tangential electric field would cause the charges to move on the surface of the conductor causing currents to flow on its surface. Therefore electrostatic field is always normal to the surface of a charged conductor at every point.
Question 4
1 / -0

Electrostatic shielding is based

A
electric field inside the cavity of a conductor is greater than zero

B
electric field inside the cavity of a plastic is zero

C
electric field inside the cavity of a conductor is zero

D
electric field inside the cavity of a conductor is less than zero

Solution

Electric field inside a cavity is always zero. The potential inside a cavity of a conductor is constant. The potential difference between any two points inside a charged conductor is zero. This phenomenon is called electrostatic shielding.