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

An electric field is applied to a semiconductor. Let the number of charge carriers be n and the average drift speed be v. If the temperature is increased,
  1. Both n and u will increase.
  2. n will increase but v will decrease.
  3. v will increase but n will decrease.
  4. Both n and v will decrease.

Assertion  :  Cyclotron is a device which is used to accelerate the positive ion.

Reason      : Cyclotron frequency depends upon the velocity.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

The resistance of an ideal ammeter is

(a) Infinite

(b) Very high

(c) Small

(d) Zero

The error in measuring the current with a tangent galvanometer is minimum when the deflection is about

(a) 0o    

(b) 30o

(c) 45o  

(d) 60o

The two waves represented by y1 = a sin(wt) and   have a phase difference of

(a) 0

(b)  

(c)  

(d)

The atomic masses of two isotopes of an element are 34.98 u and 36.98 u and their relative abundance are $75.4 \%$ and $24.6 \%$ respectively, then the average atomic mass of the element is ___________ .

In intrinsic semiconductor at room temperature, number of electrons and holes are

(a) Equal

(b) Zero

(c) Unequal

(d) Infinite

The circuit shown in Fig. acts as a.
Image
The energy gap in case of which of the following is less than 3eV?

A charged particle of mass m and charge q describes circular motion of radius r in a uniform magnetic field of strength B. The frequency of revolution is

(a)  

(b)

(c)

(d)