Two poles of same strength attract each other with a force of magnitude F when placed at the two corners of an equilateral triangle. If a north pole of same strength is placed at the […]
A thermoelectric refrigerator works on
Options
(a) Joule effect (b) Seebeck effect (c) Peltier effect (d) Thermionic emission
Correct Answer:
Peltier effect
Explanation:
No explanation available. Be the first to write the explanation […]
A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, then what is the magnetic field inside the solenoid?
The magnetic moment of a diamagnetic atom is
Options
(a) equal to zero (b) much greater than one (c) 1 (d) between zero and one
Correct Answer:
equal to zero
Explanation:
The magnetic […]
The magnetic susceptibility of a material of a rod is 299. Permeability of vacuum μ₀ is 4πx10⁻⁷ Hm⁻¹. Absolute permeability of the material of the rod is
Options
(a) 3771×10⁻⁷ Hm⁻¹ (b) 3771×10⁻⁵ Hm⁻¹ […]
The conducting loop in the form of a circle is placed in a uniform magneitc field with its plane perpendicular to the direction of the field. An emf will be induced in the loop,if
Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. If 3A and 4A are the currents flowing through the two coils, respectively. The magnetic induction (in […]
The intensity of magnetisation of a bar magnet is 5×10⁴ Am⁻¹. The magnetic length and the area if cross- section of the magnet are 12 cm and 1 cm⁻² respectively. The magnitude of magnetic moment […]
Two parallel beams of positron moving in the same direction will
Options
(a) not interact with each other (b) repel each other (c) attract each other (d) be deflected normal to the plane […]
A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth’s horizontal magnetic field of 24 microtesla. When a horizontal field […]
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