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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
1
Medium
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Analyzing
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As shown in figure a square loop made from a uniform wire. Calculate the magnetic field at the centre of the square if a battery source is connected between the points 'A' & 'C'.
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Correct option: A
Zero
Option A (Zero) is correct because the current divides equally at point A, and the magnetic fields due to opposite sides of the square cancel out at the center.
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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 :