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Mashutka [201]
3 years ago
15

A train is speeding down a railroad track at the speed of 50 miles per hour. From whose reference point is the train not moving?

Physics
1 answer:
marysya [2.9K]3 years ago
3 0

A: a person sitting on a train

Hence person could have a meal and not get food all over them.

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Answer:

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Part (a)

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B = \frac{\mu_oI}{2\pi R}

At the center, the magnetic field strength is twice

B_c = 2(\frac{\mu_oI}{2\pi R}) =\frac{ \mu_oI}{\pi R}

R = d/2 = 8.6/2 = 4.3 cm = 0.043 m

B_c = \frac{ \mu_oI}{\pi R}\\\\I = \frac{B_c\pi R}{\mu_o} = \frac{370 *10^{-6}* \pi *0.043}{4\pi *10^{-7}}\\\\I = 39.8 \ A

Therefore, current needed is 39.8 A

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