Anegatively charged rod is placed near two neutral metal spheres, a shown in the pic
which statements describe the changing method shown?
check all that apply

the spheres develop opposite charges
the spheres develop the same change
electrons move from the rod to sphere a
electrons move from sphere a to sphere b
the spheres are charged through conduction
the spheres are charged through friction
the spheres are charged through induction

The spheres are charged through induction.

Explanation: When the negatively charged rod is brought near the end of sphere A, the electrons in rod repel those at A and force them to Sphere B. So sphere A having lost electrons is now positively charged and B having received electrons becomes negatively charged.

NOTE: The Spheres have been charged by electrostatic induction because the negatively charged rod did not make a direct contact with the conducting spheres A and B. It was just brought close to the spheres.

a and b sometimes have a positive value