Question

Write a hypothesis about the effect of the magnet polarity on the induced current. Use the "if . . . then . . . because . . ." format and be sure to answer the lesson question: "How does magnetic polarity affect the current flowing in a loop of wire?"

Answer 1

Explanation :

The induced current also depends on the polarity of the magnet. Mathematically, it is given as :

$E=-B\dfrac{d\phi}{dt}$

E is the induced emf, E = IR

B is the magnetic field

$\dfrac{d\phi}{dt}$ is the rate of change of magnetic flux.

$I=-\dfrac{B}{R}\dfrac{d\phi}{dt}$

I is the induced current.

The direction of electromagnetic force is determined by polarity of the magnet.

If the polarity of the magnet is reversed then the induced current will also reversed because the direction of electromagnetic force depends on the polarity of the magnet.

Answer 2

If the polarity of a moving magnet is reversed, then the current induced in a loop of wire will reverse in direction, because magnet polarity determines the direction of the electromagnetic force.