Electromagnetic waves are transverse in nature is evident by
|
(a) Polarization |
(b) Interference |
(c) Reflection |
(d) Diffraction |
Electromagnetic waves are transverse in nature is evident by
|
(a) Polarization |
(b) Interference |
(c) Reflection |
(d) Diffraction |
(a) Polarization
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In a coil of area
and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of
gauss/second. The resistance of the coil is 20 ohm. The current in the coil will be
|
(a) 5 amp |
(b) 0.5 amp |
(c) 0.05 amp |
(d) 5 |
The two metallic plates of radius r are placed at a distance d apart and its capacity is C. If a plate of radius r/2 and thickness d of dielectric constant 6 is placed between the plates of the condenser, then its capacity will be
|
(a) 7C/2 |
(b) 3C/7 |
(c) 7C/3 |
(d) 9C/4 |
20 ampere current is flowing in a long straight wire. The intensity of magnetic field at a distance 10 cm from the wire will be
|
(a) 4 × 10–5 Wb/m2 |
(b) 9 × 10–5 Wb/m2 |
(c) 8 × 10–5 Wb/m2 |
(d) 6 × 10–5 Wb/m2 |
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 90o |
The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
| (a) 4 sec | (b) 2 sec | (c) 0.5 sec | (d) 0.25 sec |

The ratio of the longest to shortest wavelengths in Brackett series of hydrogen spectra is
|
(a) |
(b) |
(c) |
(d) |
An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
|
(a) 13.6 eV |
(b) 6.53 eV |
(c) 5.4 eV |
(d) 1.51 eV |