- A$\chi=1$ व $\mu_r=0$
- B$\chi=0$ व $\mu_r=1$
- ✓$\chi=-1$ व $\mu_r=0$
- D$\chi=0$ व $\mu_r=-1$
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Electric potential at an equatorial point of a small dipole with dipole moment P (r, distance from the dipole) is
|
(a) Zero |
(b) |
(c) |
(d) |
If the speed of light in vacuum is C m/sec, then the velocity of light in a medium of refractive index 1.5
|
(a) Is 1.5 × C |
(b) Is C |
|
(c) Is |
(d) Can have any velocity |
Angle of prism is A and its one surface is silvered. Light rays falling at an angle of incidence 2A on first surface return back through the same path after suffering reflection at second silvered surface. Refractive index of the material of prism is
|
(a) 2 sin A |
(b) 2 cos A |
(c) |
(d) tan A |

A convex lens of focal length 12 cm is made of glass of μ = . What will be its focal length when immersed in liquid of μ =
|
(a) 6 cm |
(b) 12 cm |
(c) 24 cm |
(d) 30 cm |