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A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it.

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A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field vector E at the centre O is

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The correct answer is:

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Why there is - j cap
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+1
Because net field is acting downwards which is taken as -j
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Because the direction of vector is in -ve y direction
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Represents Direction
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