Which expression represents the magnitude of the electric field at a distance from an…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which expression represents the magnitude of the electric field at a distance

r

from an isolated point charge

Q

in vacuum? (a)

\displaystyle \frac{kQ}{4r^{2}}

(b)

\displaystyle k\frac{Q}{r^{2}}

(c)

\displaystyle 4\pi k\frac{Q}{r^{2}}

(d)

\displaystyle \frac{2kQ}{r^{2}}