MCQ
If a body is charged by rubbing it, its weight:
  • A
    Always decreases slightly.
  • B
    Always increases slightly.
  • C
    May increase slightly or may decrease slightly.
  • D
    Remains precisely the same.

Answer

  1. May increase slightly or may decrease slightly.

Explanation:

If a body is charged by rubbing it, then it may lose or gain electrons. Since electrons have a mass of (9.1 × 10-31kg). So, a slight weight may increase or decrease slightly.

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 figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet

(a) OQ should be large, OR should be small

(b) OQ and OR should both be large

(c) OQ should be small and OR should be large

(d) OQ and OR should both be small

Plane figures made of thin wires of resistance R = 50 milli ohm/metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate dB/dt = 0.1 m T/s. Then currents in the inner and outer boundary are. (The inner radius a = 10 cm and outer radius b = 20 cm)

(a) 10– 4 A (Clockwise), 2 × 10– 4 A (Clockwise)

(b) 10– 4 A (Anticlockwise), 2 × 10– 4 A (Clockwise)

(c) 2 × 10– 4 A (clockwise), 10– 4 A (Anticlockwise)

(d) 2 × 10– 4 A (Anticlockwise), 10– 4 A (Anticlockwise)

If scattering particles are 56 for 90°  angle then this will be at 60°  angle

(a) 224

(b) 256

(c) 98       

(d) 108

In semiconductors, at a room temperature:

A coil having an area  is placed in a magnetic field which changes from  to   in a interval of 2 second. The e.m.f. induced in the coil will be

(a)  4 V

(b) 3 V

(c)  1.5 V 

(d) 2 V

A square conducting loop of side L and resistance R is moving in its plane with a uniform velocity v perpendicular to its one side, where magnetic induction is B which is constant in space and time and is normal to the inwards of the plane. Induced current in the coil is:
Let $\overrightarrow{\text{E}}$ and $\overrightarrow{\text{B}}$ denote electric and magnetic fields in a frame S and $\overrightarrow{\text{E}}$ and $\overrightarrow{\text{B}}$ in another frame S moving with respect to S at a velocity $\overrightarrow{\text{v}}.$ Two of the following equations are wrong. Identify them.

  1. $\text{B}_\text{y},=\text{B}_\text{y}+\frac{\text{vE}_\text{z}}{\text{c}^2}$

  2. $\text{E}_\text{y},=\text{E}_\text{y}+\frac{\text{vB}_\text{z}}{\text{c}^2}$

  3. $\text{B}'_\text{y}=\text{B}_\text{y}+\text{v}\text{E}_\text{z}$

  4. $\text{E}'_\text{y}=\text{E}_\text{y}+\text{vB}_\text{z}$

According to Gauss’s theorem in magnetism, surface integral of magnetic field intensity over a surface (closed or open) is always:

A prism (μ = 1.5) has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36’ = 0.75)

(a) 18° 36’

(b) 20° 30’

(c) 18°

(d) 22°1’

Which of the following does not fit into a group: