1. Tardigrade
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  3. Physics
  4. Points A and B are situated perpendicular to the axis of a 2 cm long bar magnet at large distance X and 3 X from its centre on opposite sides. The ratio of the magnetic fields at A and B will be approximately equal to

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Q. Points $A$ and $B$ are situated perpendicular to the axis of a $2\, cm$ long bar magnet at large distance $X$ and $3 X$ from its centre on opposite sides. The ratio of the magnetic fields at $A$ and $B$ will be approximately equal to

Solution:

$B \propto \frac{1}{x^{3}} \Rightarrow \frac{B_{1}}{B_{2}}=\left(\frac{x_{2}}{x_{1}}\right)^{3}=\left(\frac{3 x}{x}\right)^{3}=\frac{27}{1}$