Magnetic flux:

$\overline{){{\mathbf{\varphi}}}_{{\mathbf{B}}}{\mathbf{=}}{\mathbf{B}}{\mathbf{A}}{\mathbf{c}}{\mathbf{o}}{\mathbf{s}}{\mathbf{\theta}}}$ where θ is the angle between B and A.

In this problem, we are going to apply Lenz's law to get the direction of the induced current.

Lenz's law: The induced electric current flows in a direction such that the current opposes the **change **in **magnetic flux** inducing it.

The north pole of the magnet in the figure is being inserted into the coil.

In which direction is the induced current flowing through the resistor R? (Figure 1)

A. from right to left

B. from left to right

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What scientific concept do you need to know in order to solve this problem?

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