apvilap 102s16.pdf-Adobe Reader File Edit View Document Tools Window Help 1/1@@1

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apvilap 102s16.pdf-Adobe Reader File Edit View Document Tools Window Help 1/1@@129% -ES} Additional Problem VIIa for Physics 102 (from an old exam) This problem is part of your written homework for chapter 23. a) Three positive point charges, all with the same charge q, are arranged in a triangle as shown below. Co ordinates have been chosen so that one charge is on the positive y axis, and the other two are on the r axis, equidistant from the origin. Point P is on the negative y axis, as shown in the figure. (There is no charge located at P; the dot just marks a position.) Draw an arrow on the picture below to indicate the direction of the electric field at P. Explain how you found this direction. +q +q +4

Explanation / Answer

part (a)

The direction of electric field is downward as resultant of the fields of the charges on the x-axis is in downward direction and that of charge on y axis is also in downward direction.

part (b)

electric field will be zero between origin and charge of y axis because at this point resultant of electric fields of charges on y axis is in downward direction and on x axis resultant of electric fields of charges is in upward direction.

part (c)

except infinity there is no point where potential is zero because all charges have same sign.

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