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Questions  >>  CBSE XII  >>  Physics  >>  Magnetism and matter
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Q)

What is the approximate distance upto which earth's magnetic field extends?

$\begin{array}{1 1} \text{nearly 3 times the radius of the earth} \\ \text{nearly 4 times the radius of the earth} \\ \text{nearly same as the radius of the earth} \\ \text{nearly 5 times the radius of the earth}\end{array} $

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A)
Solution :
It extends upto nearly five times the radius of the earth
(ie) $5 \times (6.4 \times 10^{3} )\;km$
$\qquad= 3.2 \times 10^4 \;km$
Answer : $\text{nearly 5 times the radius of the earth}$
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