Question

ce
What is the force between two small
15 cm apart in air?
The electrostatic force on a small sphere of cha
force on a small sphere of charge 0.4 uC due to another small sphere UI
in air is 0.2 N. (a) What is the distance between the two spl
at is the distance between the two spheres? (b) What is the force on the second spui
due to the first?
Two insulated charged copper spheres A and B have their centres separate
the mutual force of electrostatic repulsion if the charge on eac
negligible compared to the distance of separation.
force of repulsion if each sphere is charged double the above amount, and the
between them is halved?
ve their centres separated by a distance of 50 cm. What is
10°C? The radii of A and B are
perfection​

Answer 1

Answer:

(a) The electrostatic force, F = 0.2 N

Charge on this present sphere, q1 = 0.4 μC = 0.4 × 10-6 C

Charge on the other sphere, q2 = –0.8 μC = -0.8 × 10-6 C

The electrostatic force between the spheres can be given by the equation,

…(1)

Where, q1 and q2 are the charges.

r is the distance between the charges.

is a constant and its value is 9x109 N m2 C-2

ϵ0 is the permittivity of free space. Its value is 8.85 x 10-12 (F/m)

Therefore, from equation (1),

⇒ r2 = 144 x 10-4 m2

Taking square root both the sides,

⇒ r =

r = 0.12 m

Hence, the distance between the two spheres is 0.12 m.