Question

For ferromagnetic material, the relative permeability (, versus magnetic intensity (H) has the following shape

(a)

(b)

(c)

(d)

Answer

(d)

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 electron (mass = 9 × 10–31kg. Charge = 1.6 × 10–19C) whose kinetic energy is 7.2 × 10–18 joule is moving in a circular orbit in a magnetic field of 9 × 10–5 weber/m2. The radius of the orbit is

(a) 1.25 cm  

(b) 2.5 cm

(c) 12.5 cm

(d) 25.0 cm

A string of negligible thickness is wrapped several times around a cylinder kept on a rough horizontal surface. A man standing at a distance 1 from the cylinder holds one end of the string and pulls the cylinder towards him. There is no slipping anywhere. The length of the string passed through the hand of the man while the cylinder reaches his hands is:
  1. l
  2. 2l
  3. 3l
  4. 4l

If   is 6563 Å, then wave length of second line for Balmer series will be

(a)  

(b)  

(c)  

(d) None of the above

The capacity of a parallel plate condenser is 10 μF, when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be

(a) 5 μF   

(b) 10 μF

(c) 20 μF

(d) 40 μF

The axis of rotation of a purely rotating body:
  1. Must pass through the centre of mass.
  2. May pass through the centre of mass.
  3. Must pass through a particle of the body.
  4. May pass through a particle of the body.
Among the following _____ has the highest retentivity.
Which among the following has a relative permeability much larger than 1?

Two resistances  and  when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by  to that consumed by  will be

(a) 1 : 1

(b) 1 : 2

(c) 2 : 1

(d) 1 : 4

Electromagnetic waves
A proton and an electron are accelerated by the same potential difference. Let $\lambda_\text{e}$ and $\lambda_\text{p}$ denote the de Broglie wavelengths of the electron and the proton respectively.