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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Assertion: Cyclotron is used to accelerate heavy charged particles, such as proton. It not suitable for accelerating light charged particles, such as electrons.
Reason: Specific charge of proton is more as compared to electron.
Reason: Specific charge of proton is more as compared to electron.
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Correct option: C
Assertion is true & Reason is false
Option C (Assertion is true & Reason is false) is correct because while the cyclotron is indeed unsuitable for accelerating light charged particles like electrons, the reason is due to relativistic mass increase, not specific charge.
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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 :