In cyclotron, for a given magnet, radius of the semicircle traced by positive ion is directly proportional to (where, v=velocity of positive ion)
Options
(a) v⁻² (b) v⁻¹ (c) v (d) v²
Correct […]
If the dipole moment of a short bar magnet is 1.25 A-m², the magnetic field on its axis at a distance of 0.5 m from the centre of the magnet is
Options
(a) 1×10⁻⁴ […]
Magnetic induction produced at the centre of a circular loop carrying current is B. The magnetic moment of the loop of radius R is (where, μ₀=permiability of free space)
Options
(a) BR²/2πμ₀ (b) […]
A dip needle vibrates in a vertical plane perpendicular to magnetic meridian. The time of vibration is found to be 25, the same needle is then allowed to vibrate in the horizontal plane and the […]
The workdone in turning a magnet of magnetic moment M by an angle of 90⁰ from the magnetic meridian is n times the corresponding work done to turn it through an angle of 60⁰. The […]
On heating a ferromagnetic substance above curie temperature
Options
(a) becomes paramagnetic (b) becomes diamagnetic (c) remains ferromagnetic with constant magnetic susceptibility (d) becomes electromagnetic
Correct Answer:
becomes paramagnetic
Explanation:
No explanation available. […]
A particle with charge q is moving along a circle of radius R with unoform speed v. The associated magnetic moment μ is given by
Options
(a) 1/2 v²R (b) 1/4 qvR (c) […]
If the velocity of charged particle has both perpendicular and parallel components while moving through a magnetic field, then what is the path followed by a charged particle?
Options
(a) Circular (b) Elliptical […]
A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation established that bismuth is
A short magnet of magnetic moment M, is placed on a straight line. The ratio of magnetic induction fields B₁, B₂, B₃ values on this line at points which are at distance 30 cm, 60 […]
2017 Copyright Doctor Dreams Training Academy