Given a current of 1.6[A]; a coil radius of 0.15[m]; and N=130, then what is the

Question

Given a current of 1.6[A]; a coil radius of 0.15[m]; and N=130, then what is the strength of the magnetic field in milliTeslas?

Answer is not 8.17 milliTeslas nor 81.7milliTeslas.

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Let's say that you are given a magnetic field B = 0.00125[Teslas]. You also have an average V / d2 = 34375[V/m2]; what is the value for e / m ? (Report your answer with three sig. figs. and use scientific notation "E". ie. 1.98E11)

Answer is not 4.4E10 or 4.40E10

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What is the accepted value for e/m? Use Scientific Notation (i.e. 1.76E11)

Answer is not -1.76E11 or 1.75888E11.

Explanation / Answer

1)

the strength of the magnetic field at the center of coil :

B = o * I * N / 2 * r
=(4 x 10^-7 * 1.6 * 130)/(2 * 0.15) = 2.773 x 10^-4 T = 0.2773 mT

3)

e = 1.602 x 10^-19 C

me = 9.109 x 10^-31 kg

e / me = (1.6 x 10^-19 C) / (9.109 x 10^-31 kg)

e / me = 1.759 x 10^11 C/kg

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