Determine which of the following statements are correct or incorrect. If a state

Question

Determine which of the following statements are correct or incorrect. If a statement is incorrect, explain how you could change it slightly to fix it. "Those strong neodymium magnets from lab pull on the weak bar magnets with a lot more force than the weak magnets pull on the strong magnets." "It's impossible to use Ampere's Law inside a wire because there's no way to get an Amperian loop through the solid metal." "That 2 meter long wire has an enormous voltage - the entire wire is at a constant 10,000V. There must be a huge electric field inside!"

Explanation / Answer

(a) False

The remaining charge inside a cellphone battery is usually measured in the units of mAh. It means the total amount of energy a battery can store at one time.

(b) True

The force of a magnet is strictly a function of its magnetism and the pull is dependent on the mass of the other magnet compared to itself. So if equal masses of unequal polestrength magnets are kept side by side then the magnet with larger mass/pole strength will win.

(c) False

Ampere's loop can be taken inside the wire. The magnetic field should still go in circular loops just as it does outside the wire.

(d) True

Which means the wire is carrying a current at 10,000 V. The electric field and voltage are proportional to each other. Except that we don't talk about resistance here.

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