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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Analyzing
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Statement I - A bar magnet can exert torque on itself due to it's own field.
Statement II - One element of a current carrying wire can exert a force on another element of same wire.
Statement II - One element of a current carrying wire can exert a force on another element of same wire.
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Correct option: A
Statement is true; Statement II is true
Option A is correct because a bar magnet cannot exert a torque on itself due to its own field, and one element of a current-carrying wire can exert a force on another element of the same wire.
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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 :