Two solid spheres A, B having masses 10kg, 12kg are kept such that the distance between their centers is 1 m as shown if radius of A = 20cm and radius of B is 40cm then gravitational force of attraction between them is equal to

Given that two solid spheres A, B

$m_A=10kg,m_B=12kg$

$r=1m,r_A=20cm,r_B=40cm$

When we are given solid spheres then they should be considered as point masses concentrated at their centers with separation $xy=1m$

Then substituting the values, we get,

$F=\frac{G{m}_A{m}_B}{r^2}=\frac{10\times 12G}{1}$

$F=120G$