Question

Which of the following is not an example of force acting at a distance?
(A) Force of gravity
(B) Magnetic force
(C) Electrical force
(D) Frictional force

Answer 1

Answer:

non of these

Explanation:

(A)act at distance

(B) " " "

(C) " " "

(D)after rubing it through some other we can attract small particles it from a distance

Answer 2

The correct option is (D).

Explanation:

The force of gravity is given by :

$F_g=G\dfrac{m_1m_2}{d^2}$

The magnetic force is given by :

$F=qvB\\\\F=qv\times \dfrac{\mu_o i}{2\pi r}$

Electrical force is given by :

$F=k\dfrac{q_q_2}{d^2}$

So, it is clear that force of gravity, magnetic force and electrical force depends on the distance. But the frictional force depends on the substances of surface.

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