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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
1
Medium
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Analyzing
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The turns of a solenoid, designed to provide a given magnetic
flux density along its axis, are wound to fill the space between
two concentric cylinders of fixed radii. How should the diameter
of the wire used be chosen so as to minimize the heat
dissipated in the windings?
flux density along its axis, are wound to fill the space between
two concentric cylinders of fixed radii. How should the diameter
of the wire used be chosen so as to minimize the heat
dissipated in the windings?
View answer and explanation
Correct option: C
Wire should be multiple of
Option C (Wire should be multiple of ) is correct because the heat dissipated is independent of the diameter of the wire, so any multiple of d will work, but the most practical is a multiple of d itself.
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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 :