Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

The electric potential decreases uniformly from 120V to 80V as one moves on the x-axis from x = -1cm to x = + 1cm. The electric field at the origin.

1. Must be equal to 20Vcm^-1
2. May be equal to 20Vcm^-1
3. May be greater than 20Vcm^-1
4. May be lees than 20Vcm^-1

In the field of electromagnetism, the term 'EMI' stands for:

Particle like behavior of light arises from the fact that each quanta of light has definite ...X... and a fixed value of ...Y.. just like a particle, Here, X and Y refer to?

A 100 ohm galvanometer gives full scale deflection at 10 mA.  How much shunt is required to read 100 mA

(a) 11.11 ohm

(b) 9.9 ohm

(c) 1.1 ohm

(d) 4.4 ohm

Water molecule is the example of:

In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁approaches a target nucleus of charge Z₂ and mass M₂, the distance of closest approach is r. The energy of the projectile is?

A group of bright and faint stars is called

(a) Galaxy

(b) Comet

(c) Black hole

(d) Constellation

By photoelectric effect, Einstein, proved

(a) E = hv

(b) K.E. =

(c)

(d)

A thin convex lens of focal length 10 cm is placed in contact with a concave lens of same material and of same focal length. The focal length of combination will be

(a) Zero

(b) Infinity

(c) 10 cm

(d) 20 cm

'Electrons revolve round the nucleus in well-defined orbits, like planets revolve round the sun' was the brainchild of: