Physics, 30.09.2019 11:30 heysorryguys

How does the magnetic force on a stationary charged particle compare to the magnetic force on a moving charged particle? a. there is no magnetic force on a moving charged particle. b. there is no magnetic force on a stationary charged particle. c. the force on a moving particle is multiplied by the magnitude of the velocity. d. the force on a moving particle is twice the force on an identical stationary particle.

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B is the most correct. This comes from Lorentz's Force Law: F = q(E+ v x B), where F is force, q is charge, E is the magnitude of the electric field, v is the velocity of the particle and B is the magnitude of the magnetic field. If we examine the v x B term (this is the only term the magnetic field contributes to), we know that the cross product will equal zero if v is zero (if the charge is stationary). If you're not terribly comfortable with cross products, change v x B into v*B*sinθ, where θ is the angle between the v and B vectors. This simplification also forces you to use the right hand rule to find the resulting direction of the cross product, but makes the math more straight forward. A is incorrect because ALL charged particles create magnetic fields that also exercise force on the particle. For C, while the force does get bigger with higher velocity, it isn't straightly multiplied, more closely it multiples the magnetic field, B, and that generates more force, but even then we only purely multiply v and B when the angle between them (θ) is 90°, so sinθ = 1 and that term disappears. D is wrong because the magnetic force on a stationary charged particle is zero, always, and when it is moving it is non-zero.

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d) the number of neutrons plus the number of protons

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elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account. she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem. she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem. her desire for the new hairstyle is in conflict with her honesty and integrity.

d. if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it. the amount she has in her account is not the problem. and if i may suggest, she might as well close her checking account, and put the money where it'll work for her. it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now. under no circumstances should he ask for a higher limit.

b. he can ask for the grace period to be extended. but that's no solution, the bank will almost certainly refuse anyway, and there are much better options. he knew the rules of his credit card when he started using it.

c. he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d. he definitely should pay the minimum otherwise they could shut down his card. he should also pay as much more as he possibly can. he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices. what he has to do: pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.

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How does the magnetic force on a stationary charged particle compare to the magnetic force on a movi...