Electric Charges — Prelims Questions

An object has a net charge of $-3.2 \times 10^{-18},\text{C}$. How many excess electrons does it possess?

Two identical conducting spheres, A and B, are initially charged with $+8,mu\text{C}$ and $-2,mu\text{C}$ respectively. If they are brought into contact and then separated, what is the final charge on sphere A?

Which of the following statements about electric charge is INCORRECT?

When a glass rod is rubbed with a silk cloth, the glass rod acquires a positive charge. This is because:

An uncharged metal sphere is brought near a negatively charged rod, but does not touch it. A grounding wire is then connected from the sphere to the Earth. What is the final charge on the sphere after the rod and grounding wire are removed?

Which of the following statements is true regarding the conservation of electric charge?