The electric field is constant over each face of the box. The contains what char

Question

The electric field is constant over each face of the box. The contains what charge? The answer is a positive charge, I just don't understand why. I thought that when the electric field was inward it was negative. Could you please break this down and explain it?

The electric field is constant over each face of the box. The contains what charge? The answer is a positive charge, I just don't understand why. I thought that when the electric field was inward it was negative. Could you please break this down and explain it?

Explanation / Answer

Here ,

let the area of each face is A

then , net flux = 10 * A + 15 *A - 15 A -20 A - 15 A + 20 A

net flux = -5 A

Now , as the net flux is inwards , the net charge must be negative

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