Question

1.A coil is mechanically rotated with constant angular speed (w) in a uniform magnetic field which is parallel to the axis of rotation of the coil, the plane of the coil initially held perpendicular to the field. Plot a trap showing variation of 1. Magnetic flux 2. The induced emf in the coil as a function of (wt).

Answer 1

All the terms, symbols and notation used below are in context with NCERT textbook.
Since we know that,Magnetic flux(ϕ): B.dA initially held perpendicular to the field means the graph for flux starts from the peakgiving a cos term in flux. as Initially angle b/w magnetic field and area is zero.ϕ = BAcos(ωt)Emf= −dϕ/dt =BAwsin(wt) 


Answer 2

Answer:

Explanation:

Magnetic flux(ϕ): B.dA initially held perpendicular to the field means the graph for flux starts from the peakgiving a cos term in flux. as Initially angle b/w magnetic field and area is zero.ϕ = BAcos(ωt)Emf= −dϕ/dt =BAwsin(wt)