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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A stretchable conducting ring is in the shape of a circle. It is kept in a uniform magnetic field (B) that is perpendicular to the plane of the ring. The ring is pulled out uniformly from all sides so as to increase its radius at a constant rate dr/dt = V while maintaining its circular shape. Calculate the rate of work done by the external agent against the magnetic force when the radius of the ring is r0. Resistance of the ring remains constant at R.

A stretchable conducting ring is in the shape of a circle. It is kept in a uniform magnetic field (B) that is perpendicular to the plane of the ring. The ring is pulled out uniformly from all sides so as to increase its radius at a constant rate dr/dt = V while maintaining its circular shape. Calculate the rate of work done by the external agent against the magnetic force when the radius of the ring is r0. Resistance of the ring remains constant at R.

as shown in . The total resistance of the loop and the wires connecting it to a sensitive ammeter is 0.50Ω. If the loop is suddenly collapsed by horizontal forces as shown The plane of a square loop of wire edge length a = 0.200 m is perpendicualr to the Earth's magnetic field at a point where B = 15.0μT what is the total charge passing through the ammeter?