KVPY Government Jobs Exams

A loop carrying current I has the shape of a regular polygon of n sides. If R is the distance from the centre to any
vertex, then the magnitude of the magnetic induction vector B
􀁇
at the centre of the loop is

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KVPY Other Question

Seven identical coins are rigidly arranged on a flat table in the pattern shown below so that each coin touches its
neighbors. Each coin is a thin disc of mass m and radius r. Note that the moment of inertia of an individual coin
about an axis passing through centre and perpendicular to the plane of the coin is mr2 / 2
The moment of inertia of the system of seven coins about an axis that passes through the point P (the centre of the
coin positioned directly to the right of the central coin) and perpendicular to the plane of the coins is– A steady current I flows through a wire of radius r, length L and resistivity ρ. The current produced heat in the
wire. The rate of heat loss in a wire is proportional to its surface area. The steady temperature of the wire is
independent of–
(A) L (B) r (C) I (D) ρ