A ferromagnetic material is heated above its curie temperature. Which one is a correct statement
| (a) Ferromagnetic domains are perfectly arranged |
| (b) Ferromagnetic domains becomes random |
| (c) Ferromagnetic domains are not influenced |
| (d) Ferromagnetic material changes itself into diamagnetic material |
(b) Ferromagnetic domains becomes random
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Two electric dipoles of moment P and 64 P are placed in opposite direction on a line at a distance of 25 cm. The electric field will be zero at point between the dipoles whose distance from the dipole of moment P is
|
(a) 5 cm |
(b) |
(c) 10 cm |
(d) |
In Young's double slit experiment, if monochromatic light is replaced by white light
|
(a) All bright fringes become white |
|
(b) All bright fringes have colours between violet and red |
|
(c) Only the central fringe is white, all other fringes are coloured |
|
(d) No fringes are observed |
A wire of length L metre carrying a current of I ampere is bent in the form of a circle. Its magnitude of magnetic moment will be
|
(a) |
(b) |
(c) |
(d) |
Magnetic fields at two points on the axis of a circular coil at a distance of 0.05m and 0.2m from the centre are in the ratio 8 : 1. The radius of the coil is
|
(a) 1.0 m |
(b) 0.1 m |
(c) 0.15 m |
(d) 0.2 m |
Angular width (b) of central maximum of a diffraction pattern on a single slit does not depend upon
|
(a) Distance between slit and source |
(b) Wavelength of light used |
|
(c) Width of the slit |
(d) Frequency of light used |
