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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
1
Medium
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Application
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A proton carrying 1 MeV kinetic energy is moving
in a circular path of radius in uniform magnetic
field. What should be the energy of an a-particle
to describe a circle of the same radius in the same
field?
in a circular path of radius in uniform magnetic
field. What should be the energy of an a-particle
to describe a circle of the same radius in the same
field?
View answer and explanation
Correct option: B
1 MeV
Option B (1 MeV) is correct because the energy of the alpha particle is equal to the energy of the proton when they have the same radius in the same magnetic field.
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Assertion: If a charged particles is moving in perpendicular uniform magnetic field, its kinetic energy does not change
Reason: Velocity of charge particle is not changing in magnetic field. Pick out the wrong statement : A steady current is flowing in a circular coil of radius , made up of a thin conducting wire. The magnetic field at the center of the loop is . Now, a circular loop of radius is made from the same wire without changing its length, by unfolding and refolding the loop, and the same current is passed through it. If new magnetic field at the center of the coil is , then the ratio is Lorentz force can be calculated by using the formula Two particles and having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius and respectively. The ratio of mass of to that of is :
Reason: Velocity of charge particle is not changing in magnetic field. Pick out the wrong statement : A steady current is flowing in a circular coil of radius , made up of a thin conducting wire. The magnetic field at the center of the loop is . Now, a circular loop of radius is made from the same wire without changing its length, by unfolding and refolding the loop, and the same current is passed through it. If new magnetic field at the center of the coil is , then the ratio is Lorentz force can be calculated by using the formula Two particles and having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius and respectively. The ratio of mass of to that of is :