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A magnet sits on a digital scale with the two poles of the magnet facing up. A rigid wire runs through the magnet. The wire is connected to a switch that connects points A and B in the circuit. The wire and switch are connected to a DC voltage source. When the switch is open the digital scale reads $252.3\text{ grams}$. When the switch is closed, the scale reads $254.1\text{ grams}$. A student wants to use these data to calculate the magnetic field strength.

What other quantities must be measured by the student so they can eventually calculate the magnitude of the magnetic field?

Select TWO answers.

A

The total length of the wire in the circuit.

B

The length of the wire within the magnetic field.

C

The current flowing through the circuit.

D

The resistivity of the wire.

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