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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Analyzing
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Statement I: When radius of a circular wire carrying current is doubled, its magnetic moment becomes four times.
Statement II: Magnetic moment is directly proportional to area of the loop.
Which of the following statement(s) is/are correct?
Statement II: Magnetic moment is directly proportional to area of the loop.
Which of the following statement(s) is/are correct?
View answer and explanation
Correct option: C
Both I and II
Option C (Both I and II) is correct because the magnetic moment is proportional to the area of the loop, and doubling the radius makes the area four times larger.
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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 :