« previous | 5 of 15 nex Item 5 Part A An electron is moving in a uniform 0.30 T
ID: 1792213 • Letter: #
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« previous | 5 of 15 nex Item 5 Part A An electron is moving in a uniform 0.30 T magnetic field; its velocity components parallel and perpendicular to the field are both 3.4 x 106 m/s What's the radius of the electron's spiral path? Express your answer using two significant figures. jam Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures. Part B How far does it move along the field direction in the time it takes to complete a full orbit about the field Express your answer using two significant figures. d= In Submit My Answers Give Up Provide Feedback ContinueExplanation / Answer
(A) for circular motion,
q v B = m v^2 / r
r = m v / q B
r = (9.109 x 10^-31)(3.4 x 10^6) / (1.6 x 10^-19 x 0.30)
r = 64.5 x 10^-6 m or 64.5 um ...........Ans
Ans: 65
(b) t = 2 pi r / v = 1.192 x 10^-10 sec
d = vt = 405 x 10^-6 m Or 405 um
Ans: 410
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