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Chapter 10

Q. 10.8

A uniform magnetic field is perpendicular to a loop of radius 1 cm. Find the value of the magnetic field such that the magnetic flux through the loop is equal to \Phi_{0}.

Strategy In general, flux of a magnetic field is a scalar product of the magnetic field with the area, or \Phi_{0}=B A \cos \theta, where A is the area of the loop and θ is the angle between the field vector and a vector normal to the loop. Because the magnetic field is perpendicular to the loop, \cos \theta=1, \text { and so } \Phi_{0}=B A.

Step-by-Step

Verified Solution

Solving for the magnetic field and using the given size of the loop,

 

\begin{aligned}B=\Phi_{0} / A &=\left(2.068 \times 10^{-15} T \cdot m ^{2}\right) /\left[\pi\left(10^{-2} m \right)^{2}\right] \\&=6.58 \times 10^{-12} T\end{aligned}

 

This exceptionally small value is an indication of the small size of the quantum fluxoid.