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This question is self-contradictory!
It is the size, or number, of the charge, ignoring any minus signs. The magnitudes of -10 and +10 are the same : in each case, 10.
If the signs of both numbers are the same, the product will be positive. If the signs of the numbers are different, the product will be negative.
The value of the quotient of two integers with different signs is the same as if the signs were the same. Because the numbers have different signs, the quotient is negative.
The sum will have the same sign as the number with the largest magnitude. If the numbers have the same magnitude, then the answer is zero, which is positive.