Question

The dimensional formula for electric field intensity is :

• A. $\left[ML{T}^{-3}{A}^{-1}\right]$
• B. $\left[ML{T}^{-1}{A}^{-3}\right]$
• C. $\left[ML{T}^3{A}^{-1}\right]$
• D. $\left[ML{T}^{-3}{A}^1\right]$

Answer 1

The correct option is A $\left[ML{T}^{-3}{A}^{-1}\right]$

The unit of electric field intensity is newton per coulomb i.e. N/C.

Newton is the unit of force and has dimensions $\left[ML{T}^{-2}\right]$

Coulomb is the unit of charge and has the dimensions $\left[A^1{T}^1\right]$

Hence the dimension of field will be $\left[ML{T}^{-3}{A}^{-1}\right]$