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1. Electric Charges and Fields
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બે વિદ્યુતભાર $+8q$ અને $-2q$ ને $x=0$ અને $x=L$ મુકતાં વિદ્યુતક્ષેત્ર કયાં બિંદુએ શૂન્ય થશે?
A
$8 L$
B
$4 L$
C
$2 L$
D
$L \over 4$
(AIEEE-2005)
Solution

(c)The net field will be zero at a point outside the charges and near the charge which is smaller in magnitude.
Suppose $E.F.$ is zero at $P$ as shown.
Hence at $P$; $k.\frac{{8q}}{{{{(L + l)}^2}}} = \frac{{k.(2q)}}{{{l^2}}}$ $==>$ $l = L.$
So distance of $P$ from origin is $L + L = 2L.$
Standard 12
Physics
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