Answer: 
Explanation:
Voltage is calculated by Ohm's Law:

<h3>During a chemical reaction,one ore more new substances forwed</h3>
Answer: B. A magnet pulls a nail towards it
Explanation: Out of the list of answers, this is the only answer where a force is acting on an object. the act of the magnet pulling on the nail is the force, and the nail is the object.