Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true
| (a) Q is of non-magnetic material |
|
(b) Q is a bar magnet identical to P, and its north pole placed on top of P's north pole |
| (c) Q is of unmagnetized ferromagnetic material |
| (d) Nothing can be said about Q's properties |
(b) Q is a bar magnet identical to P, and its north pole placed on top of P's north pole
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Gauss’s law is true only if force due to a charge varies as
|
(a) |
(b) |
(c) |
(d) |
A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected, if θ = 45° . The index of refraction of glass is
|
(a) Less than 1.41 |
(b) Equal to 1.41 |
(c) Greater than 1.41 |
(d) None of the above |
The wavelength of maximum energy, released during an atomic explosion, was 2.93 × 10–10 m. Given that the Wien's constant is 2.93 × 10–3 m K, the maximum temperature attained must be of the order of
|
(a) 10–7 K |
(b) 107 K |
(c) 10–13 K |
(d) 5.86 × 107 K |
A prism ABC of angle 30° has its face AC silvered. A ray of light incident at an angle of 45° at the face AB retraces its path after refraction at face AB and reflection at face AC. The refractive index of the material of the prism is
|
(a) 1.5 |
(b) |
(c) |
(d) |
