8 and 9 please At one instant an electron is moving in the positive x direction

Question

8 and 9 please

At one instant an electron is moving in the positive x direction along the x axis in a region where there is a uniform magnetic field in the positive z direction. When viewed from a point on the positive z axis, its subsequent motion is: a) straight ahead b) counterclockwise around a circle in the xy plane c) clockwise around a circle in the xy plane d) in the positive z direction e) in the negative z direction In the figure, the current element Ids, the point P, and the three unit vectors (A, B, C) are all in the plane of the page. The direction of dB due to this current element, at the point P points: a) in the direction marked A b) in the direction marked B c) in the direction marked C d) out of the page e) into the page

Explanation / Answer

8. as electron is moving towards + x axis, so electron being negatie charge, the force acting will be towards + y axis so it will move in counterclockwise direction around a circel in xy plane

i.e. option b is correct

9. note point P is not shown in figure.

i am assuming it on thintersection of A,B,C.

using biot savart law and right hand rule, direction of magnetic field would be into the page

i.e. option e is correct

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