Question

If the total magnetic field strength $H$ due to the earth is $28{\text{A m}}^{-1}$. Then the total magnetic induction due to the earth is:

• A. $3.52\times {10}^{-7}\text{T}$
• B. $3.52\times {10}^{-5}\text{T}$
• C. $3.52\times {10}^{-2}\text{T}$
• D. $3.52\times {10}^{-4}\text{T}$

Answer 1

The correct option is B $3.52\times {10}^{-5}\text{T}$

Given,

$H=28{\text{A m}}^{-1}$

We know that:

$B={\mu }_{0}H$

$B=4\pi \times {10}^{-7}\times 28$

$B=3.52\times {10}^{-5}\text{T}$

Hence, option $\left(B\right)$ is the correct answer.