(Based (1with the familiar notation), on the infinitely small magnetic force dF, exerted on an infinitely small charge dq, moving with the velocity v, i.e. dF v dq x B, show that the magnitude dF(x), of the force exerted on the infinitely small piece of payload of width |dx], around the location |x, can be expressed as dF(x)= idx| B(x).
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