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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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A magnet is suspended lengthwise from a spring and while it oscillates, the magnet moves in and out of the coil C connected to a galvanometer G. Then as the magnet oscillates.
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Correct option: D
Deflection of G to the left and right has decreasing amplitude
Option D is correct because as the magnet oscillates in and out of the coil, it induces a current in the coil, which causes the galvanometer to deflect left and right. The amplitude of the deflection decreases as the magnet's oscillations dampen due to energy loss.
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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 :