Electrostatic Potential and Capacitance Test

Result

Electrostatic Potential and Capacitance Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Work done by a uniform electric field E in moving a charge q a distance d from a to b is

A
q/(Ed)

B
qE/d²

C
qEd

D
qE/d

Solution

Force F = qE and the work done w = F . d = qED
Question 2
1 / -0

Which of the following is correct for energy of a dipole in a uniform electric field?

A
Dipole alligns along electric field and its energy decreases

B
Potential energy remains constant

C
It only alligns itself along the electric field

D
Energy is gained

Solution

The potential energy of an electric dipole at any point in uniform electric field is U = −p E cosθ , when the dipole alligns itself along electric field it gains low energy state during this process due to which its energy decreases.
Question 3
1 / -0

Electric Potential V at a point in an electrical field is

A
potential energy of all charges in the field.

B
potential energy of a proton placed at that point.

C
potential energy of an electron placed at that point.

D
potential energy of a unit charge placed at that point.

Solution

Electric potential V is the work done in bringing unit positive charge from infinity to the point in an electric field, and the potential energy ℧ is the work done in bringing any finite charge from infinity to the point in an electric field. They are related as, U=qV .If q =1C, U=V.
Question 4
1 / -0

In circuits, a difference in potential from one point to another is often called

A
volts

B
field

C
voltage

D
AT

Solution

Voltage is an electrical potential difference, the difference in electric potential between two places. The unit for electrical potential difference, or voltage, is the volt.
Question 5
1 / -0

The unit of potential difference as used in electrical circuits is

A
joule

B
coulomb

C
electron volt

D
volt

Solution

Volt is the s.i. unit of potential difference.