Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

The unit of permittivity of free space (∈₀) is

A
C² N^-1 m^-2

B
C² N^-2 m^-2

C
N m² C^-2

D
C N^-1 m^-1
Question 2
1 / -0

When air is replaced by a dielectric medium of dielectric constant K, the maximum force of attraction between two charges separated by a distance:

A
remains unchanged

B
decreases K times

C
increases K times

D
decreases K² times
Question 3
1 / -0

Under the influence of the coulomb field of charge +Q, a charge −q is moving around it in an elliptical orbit. Find out the correct statement(s).

A
The linear speed of the charge −q is constant

B
The angular velocity of the charge −q is constant

C
The linear momentum of the charge −q is constant

D
The angular momentum of the charge −q is constant

Solution

Since the charge –q is moving in elliptical orbit so to make its motion stable the total angular momentum of the charge is constant since it experience a centripetal force from the charge +Q so it follow the motion as the motion of earth around sun.
Question 4
1 / -0

A point charge Q is moved along a circular path around another fixed point charge. So, the work done is

A
zero only if Q returns to it's starting position

B
always zero

C
zero only if the two charges have the same magnitude and opposite signs

D
zero only if the two charges have the same magnitude

Solution

Since that circular path behaves as equipotential surface, so work done is always zero.