415. In the illustration, a cathode ray tube is set up between the magnetic pole

Question

415. In the illustration, a cathode ray tube is set up between the magnetic poles of a horseshoe magnet. The tube shoots electrons from left to right between the poles. Which of the following statements describes the path of the beam of electrons? (A) The electrons will curve upward toward the north pole as they reach (B) The electrons will curve downward toward the south pole as they (C) The electrons will maintain a straight path at constant speed through (D) The electrons will not move closer to either pole but will curve toward the region between the poles. reach the region between the poles. the region between the poles. the open end of the magnet and away from the magnet.

Explanation / Answer

(415) D.

(417) C. (Reason - radius is directly proportional to the speed)

(419) D. (Reason - F = IBL = 0.5X1.5X0.1 = 0.075 N. From Fleming's left hand rule, direction is upwards)

(421) D. (Reason - Faraday's law of electromagnetic induction. In the first half of the magnet's journey, induced current will be such that the flux will decrease. In the second half, the induced current will be such that the flux will increase.)

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