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Identical positive point charges q = 9.18 μC are fixed, one at the origin, and the...

Identical positive point charges q = 9.18 μC are fixed, one at the origin, and the other at (8.52 cm,0). Half-way between the charges, the electric field is zero. Now, suppose charge begins leaking off the charge at the origin at a constant rate:

= -7.85 pC/s.

Find  , the rate at which the electric field at the midpoint is changing, in N/C/s. The sign of your answer will give the direction in which the electric field is changing.

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