c
(c)\(F = \frac{{{\mu _0}}}{{4\pi }}\left( {\frac{{6MM'}}{{{d^4}}}} \right)\) in end-on position between two small magnets. \(\therefore \;F = {10^{ - 7}}\left( {\frac{{6 \times 10 \times 10}}{{{{\left( {0.1} \right)}^4}}}} \right) = 0.6\,N\)