The electric field at distance r from an isolated point charge q is

Question

Accepted Answer

C. {'text': 'E = kq / r²', 'label': 'C'}

1. Electric field is force per unit test charge.
2. From Coulomb's law: E = F/q_test = k q / r².
3. Direction is radially outward for positive q, inward for negative.
4. SI unit is N/C or equivalently V/m.
_Source: NCERT Class 12 Physics, Ch 1 "Electric Charges and Fields", §1.6_

Answer

{'text': 'E = kq / r', 'label': 'A'}

Answer

{'text': 'E = kq × r', 'label': 'B'}

Answer

{'text': 'E = kq × r²', 'label': 'D'}