Use the formula:

, where P is power (watts), I is current (amperes) and V is potential difference (volts).
For the first heater:


For the second heater:


For the third heater:

Since they are both positively charged, then the force would in fact be repulsion, because they are both the same. If you were to have one positively charged, and one negatively charged, then they would go towards eachother.
I hope this helps, if you need help on this question or any other questions, just ask. I am here to help.
Answer:
B) Decrease
Explanation:
Resistance offered due to inductor in any AC circuit is given as

here we know that
= angular frequency

now by ohm's law we know that

here we have

so current is inversely depends on the frequency of AC
so if frequency is increased then the current will decrease
C. Usually when an atom loses or gains an electron, it is because it is trying to satisfy the Octet Rule. The Octet Rule states that an atom is at its stablest when it has 8 valence electrons (two in helium's case)
If you look on the periodic table, elements on the left (Alkaline Metals) are the most reactive because they only have one valence electron (or electron in the outer shell). Elements on the right (Noble Gases) are the least reactive because they have a full outer shell of 8 valence electrons.
Later on you will find that as stability decreases as you go down the periodic table but that is a discussion for a different time.
I think it's 39.53
(please do calculate it. I am not completely sure)