Question

Strength of earth's magnetic field is of the order of :

• A. ${10}^{-4}T$
• B. ${10}^{-3}T$
• C. ${10}^{-5}T$
• D. ${10}^{-6}T$

Answer 1

The correct option is C ${10}^{-5}T$

$B=0.5$ Gauss$=5\times {10}^{-1}$ Gauss (because $0.5<3.16$ so make it $5\times {10}^{-1}$ Now order $={10}^{-1}$ Gauss, $={10}^{-5}$ Tesla)

or $B=5\times {10}^{-1}\times {10}^{-4}$ Tesla

$B=5\times {10}^{-5}$ Tesla

Order$={10}^{-5}$T.