উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
শূন্য
The question asks for force between two charges, but the units provided are NC⁻¹ (Electric Field). Assuming the question implies force, the calculation would be F = k q1 q2 / r². However, given the options, 'শূন্য' (zero) is likely the intended answer due to the nature of the charges or a typo in the question.