Two spherical shells have masses \( m \) and \( 2 m \) as shown. Choose the \( \mathrm{P} \) cor...

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Two spherical shells have masses \( m \) and \( 2 m \) as shown. Choose the
\( \mathrm{P} \) correct options.
(a) Between \( A \) and \( B \) gravitational field strength is zero
(b) Between \( A \) and \( B \) gravitational potential is constant
(c) There will be two points one lying between \( B \) and \( C \) and other lying between \( C \) and infinity where gravitational field strength are same
(d) There will be a point between \( B \) and \( C \) where gravitational potential
W will be zero
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