A body is negatively charged when it has electrons in excess of its normal number.
A body is negatively charged when it has electrons in excess of its normal number.
当物体所带的电子超过正常数时，该物体便带电。
A body is negatively charged when it has electrons in excess of its normal number.
当物体所带的电子超过正常数时，该物体便带电。