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IMPORTANT
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An infinitely long hollow conducting cylinder with inner radius R2 and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field, B as a function of the radial distance r from the axis, is best represented by:

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Important Questions on Magnetic Effects of Current and Magnetism

MEDIUM
JEE Main
IMPORTANT
A particle carrying a charge equal to 100 times the charge on an electron is rotating one rotation per second in a circular path of radius 0.8 m. The value of the magnetic field produced at the centre will be (μ0= permeability for vacuum)
HARD
JEE Main
IMPORTANT
A circular coil, carrying a constant current i is kept in the x-y plane. The magnetic flux through the entire x-y plane excluding the area of the circular coil is given by ϕ and the magnetic flux through the area of the circular coil area is given by ϕ0, then
EASY
JEE Main
IMPORTANT
Magnetic lines of force due to a bar magnet do not intersect, because
MEDIUM
JEE Main
IMPORTANT
A long straight wire carrying a current of 30 A is placed in an external uniform magnetic field of induction 4×104 T . The direction of external magnetic field is along the direction of the current. The magnitude of the resultant magnetic induction at a point 2.0 cm away from the wire is n×10-4 T. What is the value of n?
MEDIUM
JEE Main
IMPORTANT
An electric charge +q moves with velocity v=3i^+4j^+k^, in an electromagnetic field given by: E=3i^+j^+2k^ and  B=i^+j^-3k^. The y-component of the force experienced by +q is
MEDIUM
JEE Main
IMPORTANT
What is the radius of the helix formed when a proton enters a region of uniform magnetic field B of 0.5 T with velocity v at an angle 45° with B and P is the pitch of the helical path?
MEDIUM
JEE Main
IMPORTANT
An electron and a proton enter a region of uniform magnetic field, in a direction at right angles to the field, with the same kinetic energy. They describe a circular paths of radius re and rp, respectively. Then,
MEDIUM
JEE Main
IMPORTANT

A particle with charge q, moving with a momentum p enters a uniform magnetic field normally. The magnetic field has magnitude B and is confined to a region of width d, where d<pBq, The particle is deflected by an angle θ in crossing the field

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