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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Application
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A maximum current of 0.5 mA can be passed through a galvanometer of resistance . Calculate the resistance to be connected in series to convert it into a volt meter of resistance range.
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Correct option: A
9980
Option A (9980) is correct because the series resistance needed to convert the galvanometer into a voltmeter is calculated using the formula R = G(n-1).
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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 :