# 17 - Moving charge magnetism and force in magnetic field Questions Answers

An electron originates at a point A lying on the axis of a straight solenoid and moves with a velocity v at an angle α to the axis. The magnetic induction of the field is B. Find the distance r from the axis to the point on the screen into which the electron strikes. The screen is oriented at right angles to the axis and is located at a distance l from the point A.

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**Asked By: LUFFY**

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$Magnetictorque=\overrightarrow{M}\times \overrightarrow{B}=i\overrightarrow{A}\times \overrightarrow{B}\phantom{\rule{0ex}{0ex}}Torqueduetogravityaboutthepointof\phantom{\rule{0ex}{0ex}}circumference=\overrightarrow{R}\times m\overrightarrow{g}\phantom{\rule{0ex}{0ex}}Nowcomparethetwo$Inform for any issue