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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Kirchhoff's second law is based on the law of conservation of
|
(a) Charge |
(b) Energy |
|
(c) Momentum |
(d) Sum of mass and energy |
A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is
|
(a) 4.81 eV |
(b) 3.74 eV |
(c) 2.66 eV |
(d) 1.07 eV |
The ratio of intensities of two waves are given by 4 : 1. The ratio of the amplitudes of the two waves is
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |