MCQ
Two identically charged spheres when suspended by strings of equal lengths make an angle of 30 with each other. The angle remains the same when they are immersed in a liquid of density less than the density of the material of the spheres. Choose the correct option
  • A
    The electric force between them increases.
  • B
    The electric force between them decreases.
  • C
    The net downward force will increase.
  • D
    The net downward force will remain unchanged.

Answer

  1. The electric force between them decreases.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The de-Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is $\text{v}_\text{e}=\frac{\text{c}}{100}$. Then:

A current carrying long solenoid is placed on the ground with its axis vertical. A proton is falling along the axis of the solenoid with a velocity v. When the proton enters into the solenoid, it will

(a) Be deflected from its path

(b) Be accelerated along the same path

(c) Be decelerated along the same path

(d) Move along the same path with no change in velocity

Two periodic waves of amplitudes A1 and A2 pass through a region. If A1 > A2, the difference in the maximum and minimum resultant amplitude possible is:
  1. 2A1
  2. 2A2
  3. A1 + A2
  4. A1 - A2

A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later

(a) 1.0 micro curies

(b) 0.5 micro curies

(c) 4 micro curies

(d) 8 micro curies

Select the correct alternative, The angle between the normal and refracted ray is called:

Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is

(a) 80 W 

(b) 176 W

(c) 88 W  

(d) 36 W

The capacity of any conductor is :
What do you understand by the static or frictional electricity?

The bottom of a container filled with liquid appear slightly raised because of

(a) Refraction

(b) Interference

(c) Diffraction

(d) Reflection

If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be

(a) 9 : 4   

(b) 4 : 3

(c) 3 : 8    

(d) 3 : 2