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A student hangs a $25.00 \text{ gram}$ metal sphere on a light spring. (The sphere is electrically insulated from the spring.) The spring stretches vertically by $6.30\text{ mm}$.

The student then applies a positive electric charge to the metal sphere. When a downward-directed electric field is turned on in the area of the sphere, the spring stretches some distance farther than $6.30\text{ mm}$.

Which of the following quantities must be measured so that the student can calculate the charge that was applied to the metal sphere?

A

The additional distance that the spring stretched.

B

The new mass of the metal sphere after charge was applied.

C

The downward-directed electric field.

D

The spring constant.

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