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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Medium
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Understanding
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Assertion (A): The coil is bound over the metallic frame in moving coil galvanometer.
Reason (R): The metallic frame helps in making steady deflection without any oscillations.
Reason (R): The metallic frame helps in making steady deflection without any oscillations.
View answer and explanation
Correct option: A
Both assertion and reason are true and reason is the correct explanation of assertion
Option A is correct because the metallic frame in a moving coil galvanometer provides electromagnetic damping, which helps to make the deflection steady without oscillations.
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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 :