A proton of mass m and charge q is moving in a plane with kinetic energy E. If there exists a uniform magnetic field B, perpendicular to the plane motion, the proton will move in […]
A magnetic needle suspended parallel to a magnetic field requires √3 J of work to turn it through 60⁰. The torque needed to maintain the needle in this position will be:
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(a) […]
Two lines of force due to a bar magnet
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(a) Intersect at the neutral point (b) Intersect near the poles of the magnet (c) Intersect on equatorial axis of the magnet (d) […]
The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 μT. What will be […]
The horizontal and vertical components of earth’s magnetic field at a place are 0.3 G and 0.52 G. The earth’s magnetic field and the angle of dip are
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(a) 0.3 G and δ=30⁰ […]
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole It:
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(a) will become rigid showing no movement (b) will stay in any position […]
The magnetic susceptibility is negative for
Options
(a) Paramagnetic materials (b) Diamagnetic materials (c) Ferromagnetic materials (d) Paramagnetic and ferromagnetic materials
Correct Answer:
Diamagnetic materials
Explanation:
No explanation available. Be the first to […]
A short bar magnet of magnetic moment 0.4 JT⁻¹ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equlibrium when the potential energy is
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(a) -0.064 […]
A toroid having 200 turns caries a current of 1 A. The average radius of the toroid is 10 cm. The magnetic field at any point in the open space inside the toroid is
There are four light-weight-rod samples A,B,C,D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted (i) A is feebly repelled (ii) B is feebly attracted […]
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