The ultimate individual unit of magnetism in any magnet is called
Options
(a) North pole (b) South pole (c) Dipole (d) Quadropole
Correct Answer:
Dipole
Explanation:
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An iron rod of volume 10⁻⁴ m³ and relative permeability 1000 is placed inside a long solenoid having 5 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment […]
Two thin long conductors seprated by a distance d carry currents I₁ and I₂ in the same direction. They exert a force F on each other. Now, the current in one of them is increased […]
If a steel wire of length l and magnetic moment M is bent into a semicircular arc, then the new magnetic moment is
Options
(a) Mxl (b) M/l (c) 2M/π (d) M
Correct […]
If a magnet is suspended at an angle 30⁰ to the magnetic meridian, the dip needle makes angle of 45⁰ with the horizontal. The real dip is
Options
(a) tan⁻¹(√3/2) (b) tan⁻¹(√3) (c) tan⁻¹(3/√2) […]
Two 220V – 100W bulbs are connected first in series and then in parallel. Each time the combination is connected to 220 V AC supply line. The powers drawn by the combination in each case […]
Electromagnets are made of soft iron because soft iron has
Options
(a) Low magnetic susceptibility and low retentivity (b) High magnetic susceptibility and low retentivity (c) High magnetic permeability and high retentivity (d) […]
An electron in a circular orbit of radius 0.05 nm performs 10¹⁶ rev/s. The magnetic moment due to this rotation of electron is (in A-m²)
Options
(a) 2.16×10⁻²³ (b) 3.21×10⁻²² (c) 3.21×10⁻²⁴ (d) […]
when a magnetic field is applied on a stationary electron, then it
Options
(a) remains stationary (b) spins about its own axis (c) moves in the direction of the field (d) moves perpendicular […]
The horizontal component of earth’s magnetic field at a place is 3×10⁻⁴ T and the dip is tan⁻¹ (4/3). A metal rod of length 0.25m is placed in N-S direction and is moved at a […]
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