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General
Easy
Question
A straight rod of mass m and length L is suspended from the identical spring as shown in the figure. The spring stretched by a distance of x0 due to the weight of the wire. The circuit has total resistance RW. When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
; directed outward from the plane of the paper
directed outward from the plane of the paper
directed into the plane of the paper
directed into the plane of the paper
; directed outward from the plane of the paper
directed outward from the plane of the paper
directed into the plane of the paper
directed into the plane of the paper
The correct answer is: ; directed outward from the plane of the paper
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