A square loop of side rotates with a constant angular speed of about an axis that…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A square loop of side

20\,\text{cm}

rotates with a constant angular speed of

50\,\text{rad}\,\text{s}^{-1}

about an axis that lies in the plane of the loop and is perpendicular to a uniform magnetic field of

0.25\,\text{T}

. At

t=0

the plane of the loop is perpendicular to the field. The magnetic flux through the loop at

t=0.02\,\text{s}

is closest to (a)

8.4\times10^{-3}\,\text{Wb}

(b)

1.0\times10^{-2}\,\text{Wb}

(c)

5.4\times10^{-3}\,\text{Wb}

(d)

0\,\text{Wb}