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Physics-

General

Easy

Question

If $E subscript a end subscript$ be the electric field strength of a short dipole at a point on its axial line and $E subscript e end subscript$ that on the equatorial line at the same distance, then

$E_{e} = 2 E_{a}$
$E_{a} = 2 E_{e}$
$E_{a} = E_{e}$
None of the above

The correct answer is: $E subscript a end subscript equals 2 E subscript e end subscript$

We have $E subscript a end subscript equals fraction numerator 2 k p over denominator r to the power of 3 end exponent end fraction$ and $E subscript e end subscript equals fraction numerator k p over denominator r to the power of 3 end exponent end fraction semicolon blank therefore E subscript a end subscript equals 2 E subscript e end subscript$

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Physics-General

The equivalent capacitance between $A$ and $B$ as shown in the figure is

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Physics-General

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The relation $R$ is

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