Questions
In figure, a square loop PQRS of side a and resistance r is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 1800 about an axis parallel to the long wire and passing through the midpoints of the sides QR and PS. The total amount of charge which passes through any point of the loop during rotation is
detailed solution
Correct option is B
Initial flux:ϕ1=-∫a2aμ0Ia2πdxx=-μ0Ia2πIn2Final flux: ϕf=μ0Ia2π In 2charge flown: q=∆ϕr=ϕf-ϕir=μ0Iaπr In 2Similar Questions
An elasticized conducting band r is around a spherical balloon T (figure). Its plane passes through the center of the balloon. A uniform magnetic field of magnitude 0.04 T is directed perpendicular to the plane of the band. Air is let out of the balloon at 100 cm3s-1 at an instant when the radius of the balloon is 10 cm. The induced emf in the band is
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