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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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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 64
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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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 66
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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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 67
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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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 68
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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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 69
The minimum magnetic dipole moment of an electron in a hydrogen atom is:-
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 70
Two wires carrying
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 71
A current loop in magnetic field:
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 72
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