PhysicsAdvancedHigh School (11–12)Electricity & Magnetism › Magnetic Effects of CurrentJEE MainNEETAEEE (Amrita)AMUEEEAP EAPCETBCECE
Created by StemPy LabA 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?
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← Four long straight wires pass through the corners A, B, C and D of a square, perpendicular to the page, as in the figure. Each carries the same current I: out of the page in A and B, into the page in C and D. A fifth long straight wire passes through the centre O of the square and carries a current I out of the page. Only the four other wires act on the fifth. In which direction is the force on the fifth wire?A 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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