MCQ
Earth’s potential is _______?
  • A
    Zero.
  • B
    Highly positive.
  • C
    Highly negative.
  • D
    Varies from place to place.

Answer

  1. Zero.

Explanation:

We consider earth as the storage of infinite positive as well as a negative charge. Therefore, the potential of the earth is always considered to be zero and the potential of every body is measured with respect to earth. That’s why if we connect any charged body to the earth, its potential instantaneously becomes zero.

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 light of wavelength 6328 Å is incident on a slit of width 0.2 mm perpendicularly, the angular width of central maxima will be

(a) 0.36°

(b) 0.18 °

(c) 0.72°  

(d) 0.09°

An alpha particle moving with an initial velocity (uj)enters a region of uniform magnetic field B=Bk. the de-Broglie wavelength of the alpha particle.
In the circuit shown in Fig. initially key K1 is closed and key K2 is open. Then K1 is opened and K2 is closed (order is important). [Take Q1' and Q2' as charges on C1 and C2 and V1 and V2 as voltage respectively.]

 

Then

An object 5 cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm The size of the image is

(a) 0.11 cm

(b) 0.50 cm

(c) 0.55 cm

(d) 0.60 cm

Ionization energy of hydrogen is 13.6 eV. If h = 6.6 , the value of R will be of the order of

(a)  

(b)  

(c)  

(d)  

The period of oscillation of a magnet in vibration magnetometer is 2 sec. The period of oscillation of a magnet whose magnetic moment is four times that of the first magnet is

(a) 1 sec

(b) 4 sec

(c) 8 sec  

(d) 0.5 sec

If in the experiment of Wheatstone’s bridge, the positions of cells and galvanometer are interchanged, then balance point will:
A plane electromagnetic wave of frequency 28MHz travels in free space along the positive x-direction. At a particular point in space and time, electric field is 9.3V/m along positive y-direction. The magnetic field (in T) at that point is 
Power factor of LCR circuit in resonance is:
Consider a light beam incident from air to a glass slab at Brewster's angle as shown in Fig. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.