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5.Magnetism and Matter
medium
Points $A$ and $B$ are situated along the extended axis of $2\, cm$ long bar magnet at a distance $x $ and $2x$ $ cm$ respectively. From the pole nearer to the points, the ratio of the magnetic field at $ A$ and $B$ will be
A
$4 : 1 $ exactly
B
$4 : 1$ approx.
C
$8 : 1 $ exactly
D
$8 : 1$ approx.
Solution
$ \Rightarrow \frac{{{B_1}}}{{{B_2}}} = {\left( {\frac{{{x_1}}}{{{x_2}}}} \right)^3} = {\left( {\frac{x}{{2x}}} \right)^3} = \frac{1}{8}$ (Approx.)
Standard 12
Physics
