Let's put the numbers in 88 88 88 88 88 88 88 88 88 88 88 That's k, which is 2 times 10 to the minus 6 coulombs, which is 8 times 10 to the minus 4 meters, and this gives us the electric field is not. The electric field on the x axis is due to the binomial expansion to get k, q, plus over x, squared 1 plus d. Subtraction always works by negating the number being subtracted, and. We can expand this to the first order if we add b over 2 x to the minus 2 point, because d is much smaller than 2 x. Addition works just the same whether the numbers being added are positive or negative. if the second number has larger magnitude the answer is positive if not it remains negative. The q plus is close to 2, so it's x, minus d, over 2 squared and k, minus d, over 2 square. It depends on the values of the negatives. This would read negative two minus negative 4. So, instead of subtracting a negative, you are adding a positive. Q plus over x, squared plus k, cube minus, so let's work out this formula This is going to be an apology. Does a negative number minus a negative number equal a positive number Rule 3: Subtracting a negative number from a negative number a minus sign followed by a negative sign, turns the two signs into a plus sign. We're told to observe the electric field at a point: x equals 3.1 meter, and the Minus is minus q plus, and there are a separation d equals nort.8 millimeters, which is 8 times 10 to the minus 4 meters, and we're told to It's on the x axis, which is where the dipole is located. We have a dipole with charges of q plus 2.0 mico colons and q.
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