Question

Mary is trying to determine the charge of an object in the lab. She observes that it is repelled by a positively charged rod. What can you say about the charge of the object?

Answer 1

it is positively charged you can think them as a point charge

Answer 2

or you can think positive rod will produce electric field then this electiric field repel positively charged particles and atract negatively charged particles

Answer 3

Thank you