Electrostatic| Practice MCQs Physics for Mdcat | mosaicbro.com
Electrostatic| Practice MCQs Physics for Mdcat
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Review Answers:
64
When the distance between two charged particles is halved, the force between them becomes:
Correct Answer:D
Explanation:
Force is inversely proportional to $r^2$, so halving the distance quadruples the force.
65
Two charges are placed at a certain distance apart. A brass sheet is placed between them. The force between them will:
Correct Answer:A
Explanation:
A brass sheet (conductor) can alter the electric field, potentially increasing the force.
66
Two charges are placed at a distance apart. If a glass slab is placed between them, force between them will:
Correct Answer:C
Explanation:
A glass slab (dielectric) reduces the force between charges.
67
There are two charges +1 micro – coulomb and 5 micro – coulomb. The ratio of the forces acting on them will be:
Correct Answer:B
Explanation:
The forces are equal in magnitude but opposite in direction (Newton's third law).
68
$F_e$ and $F_c$ represent gravitational and electrostatic force respectively between electrons situated at a distance of 10 cm. The ratio of $F_e / F_c$ is of the order:
Correct Answer:D
Explanation:
Electrostatic force is vastly stronger than gravitational force for electrons.
69
The ratio of the forces between two small spheres with constant charges (a) in air (b) in a medium of dielectric constant k is respectively:
Correct Answer:B
Explanation:
The force in a medium is reduced by a factor of the dielectric constant $k$.
70
A charge $q_1$ exerts some force on a second charge $q_2$. If third charge $q_3$ is brought near $q_1$, the force of $q_1$ exerted on $q_2$:
Correct Answer:D
Explanation:
The presence of $q_3$ alters the net force depending on its charge.