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. "Right now my cell phone is charged up with 5V of charge." "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

1. Volt is a unit of potential difference and not charge. Fix the statement by changing the unit of charge.

2. Force by a strong magnet on weak magnet should be equal by a weak magnet on a strong magnet. By Newton's third law.

3. The statement is wrong because ampere loop can be constructed inside a solid metal.

4. Current carrying wire is electrically neutral . There is no any charge enclosed in any Gaussian surface. So flux in a Gaussian surface is zero. So field inside is zero. There is an enormous electric field along the length of the wire. E=V/l

=10000/2 = 5000 V/m

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