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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Application
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When a high resistance R is connected in series with a voltmeter of resistance G, the range of the voltmeter increases 10 times then G:R will be
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Correct option: C
Option C (1:9) is correct because the series resistance required to increase the voltmeter range by a factor of 10 is 9 times the voltmeter's resistance.
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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 :