Consider the points lying on a straight line joining two fixed opposite charges. Between the charges there is
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(d) When two opposite charge separated by a certain distance then at two points potential is zero. One point exist between the charges and other exists outside them. Also no point, exists between the opposite charges. Where electric field is zero.
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A solid uncharged conducting sphere has radius $3a$ contains a hollowed spherical region of radius $2a$. A point charge $+Q$ is placed at a position a distance a from the common center of the spheres. What is the magnitude of the electric field at the position $r = 4a$ from the center of the spheres as marked in the figure by $P?$ $\left( {k = \frac{1}{{4\pi { \in _0}}}} \right)$
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