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Question

A magnetic field stack B with rightwards arrow on top equals B subscript 0 end subscript stack j with rightwards arrow on top exists in the region a less than x less than 2 a and stack B with rightwards arrow on top equals negative B subscript 0 end subscript stack j with bar on top in the region 2 a less than x less than 3 a, where B subscript 0 end subscript is a positive constant. A positive point charge moving with a velocity stack v with rightwards arrow on top equals v subscript 0 end subscript stack i with bar on top where V subscript 0 end subscript is a positive constant, enters the magnetic field at x = a. The trajectory of the charge in this region can be like

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The correct answer is:


    stack F with rightwards arrow on top subscript m end subscript equals q left parenthesis stack v with rightwards arrow on top cross times stack B with rightwards arrow on top right parenthesis

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