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The magnetic field at a distance a from the long current-carrying wire is proportional to:-

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Important Questions on Magnetic Effect of Current

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A cyclotron is used to accelerate charged particles. Then the time period under the influence of 1 T magnetic field of a proton:-
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A proton carrying 1MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an α - particle to describe a circle of same radius in the same field ?
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A wire of mass 100 gm, length 1 m and current 5 A is balanced in midair by a magnetic field B, then find the value of B:-
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A toroid with a mean radius r, the diameter 2a has N turns carrying current I. What is the magnetic field B outside the toroid?
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The minimum magnetic dipole moment of an electron in a hydrogen atom is:-
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When a proton is released from rest in a room, it starts with an initial acceleration a0 towards west. When it is projected towards north with a speed v0 it moves with an initial acceleration 3a0 towards west. The electric and magnetic fields in the room are