Nothing
What happens when you inadvertently crossed the positive battery terminal from a negative to a positive and a positive to a negative.?Read more: What_happens_when_you_inadvertanly_crossed_the_positive_battery_terminal_from_a_negative_to_a_positive_and_a_positive_to_a_negative.
Voltmeter will give you opposite readings or will not work at all.
It could cause the battery to explode. It can also destroy some of the electronics in the vehicle. In other words this would be a very expensive mistake.
Nothing as long as you did not then connect the other cable.
Very Dangerous........it would be a dead short. andcouldcause a fire or explosion.
Nothing. An auto battery system is 12V DC. If both terminals aren't in the loop (positive through the current path and back to negative) nothing happens.
a negative divided by a negative is a positive
Becomes a negative.
Dividing a negative number by a positive number results in a negative answer.
Adding a negative amount is equivalent to subtracting a positive amount.
Subtracting a negative is like adding a positive; the result will be positive.
You should connect the negative cable to the negative. Your question sort of stopped. Connect to a negative what?