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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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A moving coil galvanometer A has 200 turns and resistance . Another meter B has 100 turns and resistance . All the other quantities are same in both the cases. The current sensitivity of the galvanometer is
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Correct option: C
Option C () is correct because the current sensitivity of a galvanometer is directly proportional to the number of turns.
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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 :