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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Medium
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Application
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A battery of emf and internal resistance supplies a current through a coil of resistance . A voltmeter of resistance is used to measure the potential difference across the coil. What would be the reading on the voltmeter ?
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Correct option: A
11.52 V
Option A (11.52 V) is correct because it is the voltage reading calculated by considering the parallel combination of the coil and voltmeter resistances and the internal resistance of the battery.
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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 :