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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A flat coil, in the shape of a spiral, has a large number of turns N. The turns are wound tightly and the inner and outer radii of the coil are a and b respectively. A uniform external magnetic field (B) is applied perpendicular to the plane of the coil. Find the emf induced in the coil when the field is made to change at a rate dB/dt = alpha.

A flat coil, in the shape of a spiral, has a large number of turns N. The turns are wound tightly and the inner and outer radii of the coil are a and b respectively. A uniform external magnetic field (B) is applied perpendicular to the plane of the coil. Find the emf induced in the coil when the field is made to change at a rate dB/dt = alpha.

A flat coil 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 in the shape of a spiral 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?