PhysicsHardHigh School (11–12)Electricity & Magnetism › Magnetic Effects of CurrentNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabA proton moves at right angles to a uniform magnetic field, on a circle, at a speed far below the speed of light. Two statements about its motion, when the speed is doubled and the field stays the same, are given below. Statement I: The proton completes each circle in half the time, because it travels twice as fast. Statement II: The radius of the circle is doubled, and the magnetic force on the proton is also doubled.
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← A proton and an alpha particle, which is a helium nucleus with four times the mass and twice the charge of a proton, enter the same uniform magnetic field at right angles to it. The two particles have the same kinetic energy. Each moves on a circle in the field. Compare the radii of the two circles and the times that the two particles take for one revolution. Which statement is correct?The figure shows hysteresis loops of two ferromagnetic materials, X and Y. Six statements follow.
(i) Y has the larger coercivity.
(ii) Y has the larger retentivity.
(iii) Y loses less energy per cycle than X.
(iv) X suits a transformer core better than Y.
(v) Y suits a permanent magnet better than X.
(vi) X keeps no induction once H is reduced to zero.
How many of the statements above are correct? →
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