Draw an arrow indicating the direction of the magnetic field at point P due to the magnetshown. (2 marks)(b) Describe the effect on a positively-charged particle travelling into the page at P
Question
Draw an arrow indicating the direction of the magnetic field at point P due to the magnetshown. (2 marks)(b) Describe the effect on a positively-charged particle travelling into the page at P
Solution
(a) To draw the magnetic field at point P due to the magnet, you need to remember that magnetic field lines always run from the North pole to the South pole of a magnet. If the magnet is not specified, you can assume a standard bar magnet with the North pole on the left and the South pole on the right. At point P, the magnetic field would be directed from left to right. So, you would draw an arrow pointing from left to right at point P.
(b) The effect on a positively-charged particle travelling into the page at P would depend on the direction of the magnetic field. According to the right-hand rule, if the thumb of your right hand points in the direction of the positive charge's velocity (into the page at P), and your fingers point in the direction of the magnetic field (from left to right), then your palm points in the direction of the force. In this case, the force would be coming out of the page. This means that the positively-charged particle would be deflected out of the page.
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