Electrostatic Potential and Capacitance Test

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Electrostatic Potential and Capacitance Test - 1

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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
qE/d²

B
q/(Ed)

C
qE/d

D
qEd

Solution

Explanation:
Force F=qEF=qEand the work done W=F∙d=qEd
Question 2
1 / -0

If a charge moves in an electrical field

A
energy is gained

B
energy is unchanged

C
energy is conserved

D
energy is lost

Solution

Explanation:
Ambiguous question. Energy may be gained or lost depending on the sign of the charge and the electric field. It can also remain unchanged if the charge moves perpendicular to the direction of the field.
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

Explanation:
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, .If q =1C, ℧=V
Question 4
1 / -0

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

A
field

B
AT

C
voltage

D
volts

Solution

Explanation:
Voltage is the common term used for potential difference or e m f.
Question 5
1 / -0

If a positive charge moves in the direction of the electric field

A
Field does negative work on charge,potential energy increases

B
Field does positive work on charge,potential energy decreases

C
Field does positive work on charge,potential energy increases

D
Field does negative work on charge,potential energy decreases

Solution

Explanation:
A positive charge experiences a force in the direction of the field. If it moves in the direction of the field, positive work is done by the electric field on the charge. Potential energy of the charge increases only when an external source does work on the charge against the direction of the field- eg: when the charge is moved against the direction of the field
Question 6
1 / -0

If a positive charge moves opposite to the direction of the electric field

A
Field does negative work on charge,potential energy decreases

B
Field does positive work on charge,potential energy decreases

C
Field does negative work on charge,potential energy increases

D
Field does positive work on charge,potential energy increases

Solution

Explanation:
A positive charge experiences a force in the direction of the field. If it moves opposite to the direction of the field, negative work is done by the electric field on the charge. Potential energy of the charge increases since an external source is required to do work on the charge against the direction of the field, and the work done is stored in the charge as its potential energy.
Question 7
1 / -0

The unit of potential difference as used in electrical circuits is

A
joule

B
electron volt

C
coulomb

D
volt

Solution

Explanation:

Volt is the unit of potential difference.

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Electrostatic Potential and Capacitance Test - 1

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Electrostatic Potential and Capacitance Test - 1

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SHARING IS CARING

Question 1

qE/d2

q/(Ed)

qE/d

qEd

Solution

Question 2

energy is gained

energy is unchanged

energy is conserved

energy is lost

Solution

Question 3

potential energy of all charges in the field.

potential energy of a proton placed at that point.

potential energy of an electron placed at that point.

potential energy of a unit charge placed at that point.

Solution

Question 4

field

AT

voltage

volts

Solution

Question 5

Field does negative work on charge,potential energy increases

Field does positive work on charge,potential energy decreases

Field does positive work on charge,potential energy increases

Field does negative work on charge,potential energy decreases

Solution

Question 6

Field does negative work on charge,potential energy decreases

Field does positive work on charge,potential energy decreases

Field does negative work on charge,potential energy increases

Field does positive work on charge,potential energy increases

Solution

Question 7

joule

electron volt

coulomb

volt

Solution

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qE/d²