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Below are the choices that can be found from other sources:


A) 29 mJ
B) 57 mJ
C) 10 mJ
D) 100 mJ
E) 570 mJ

The answer is A) 29 mJ

Answer:

The energy stored in a room is 0.0286 Joules.

Explanation:

Given that,

The dimensions of the room are 3 m by 4 m by 2.4 m

The strength of the Earth's magnetic field, \(B=5\times 10^{-5}\ T\)

We need to find the energy stored in a room due to the Earth'a magnetic field. It is given by :

\(E=\dfrac{B^2}{2\mu_o}V\)

Here,

V is the volume of the room

\(E=\dfrac{(5\times10^{-5})^{2}}{2\times4\pi\times10^{-7}}\times(3\times4\times2.4)\\\\E=0.0286\ J\)

\(E=0.0286\ J\)

So, the energy stored in a room is 0.0286 Joules. Hence, this is the required solution.

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