Question

If a rod moves a distance \[dx\] in time \[dt\], what is the change in magnetic flux used in the Faraday's Law derivation?

Options

• \[d\Phi=B\cdot dx/l\]

• \[d\Phi=B\cdot l\cdot dx\]

• \[d\Phi=l\cdot dx/B\]

• \[d\Phi=B\cdot l\cdot dt\]

Answer 1

The rod's displacement \[dx\] sweeps out an area \[l\cdot dx\]. Multiplying this area by the magnetic field gives \[d\Phi=B\cdot l\cdot dx\].