A) $\frac{1}{2}mgR$
B) $\frac{3}{2}mgR$
C) $mgR$
D) $2mgR$
सही उत्तर: A
$\Delta PE=\frac{GMm}{r_1}-\frac{GMm}{r_2}$
$\frac{GMm}{R}-\frac{GMm}{2R}$
$\frac{GMm}{2R}-\frac{mgR}{2}$
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