Apiece of candy has 5 calories (or 5000 calories). if it could be burned, leaving nothing but carbon dioxide and water, how much heat would it give off?

5 kilocalories

Explanation:

The heat is a way of energy and it can be measured by calories, but the calories of the heat (thermal calories) are different for the food Calories.

1 food Calories = 1000 thermal calories

5 food Calories = 5000 calories = 5 kilocalories

Thus, when a piece of candy is totally burned, the thermal calorie presented in it will be released as heat.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach