Question

What happens when a regular pentagon has four charges at four ends?What can you say about the potential gradient and potential?

Answer 1

When regular pentagon has four charges at four ends,you can short this problem by considering another charge at fifth point in case of electric field calculation.

In case of potential,apply simple formula which is given in your book.

Thanks.
Tripathy.

Answer 2

When regular pentagon has four charges at four ends,we can solve this problem by considering another charge at fifth point in case of electric field calculation