An alpha particle (charge +2e) and an electron move in opposite directions from

Question

An alpha particle (charge +2e) and an electron move in opposite directions from the same point, each with the speed of 2.80x105 m/s (Figure 1). Find the magnitude of the total magnetic field these charges produce at point P which is 8.25 nm from each charge Express your answer with the appropriate units B-Vae Units SubmitPr ious Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B Find the direction of this magnetic field O to the left O out of the page O to the right Figure 1 of 1 into the page Submit Request Answer 140° Provide Feedback Next > 1+ Electron Alpha particle

Explanation / Answer

a) B = [ (mu0 / 4pi) v / r2 ] * ( 2e + e ) * sin 140

B = [ 10-7 * 2.80 * 105 / (8.25 * 10-9)2 ] * 3 * 1.6 * 10-19 * sin 140

= 4.11 * 1014 * 3.08 * 10-19

B = 1.26 * 10-4 T

b) out of the page

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