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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?

Select TWO answers.


The additional distance that the spring stretched.


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


The downward-directed electric field.


The spring constant.

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