Two like magnetic poles of strength $10$ and $40$ $S I$ units are separated by a distance $30 c m$ . The intensity of magnetic field is Zero on the line joining them.

At a point

10 c m

from stonger pole.

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At a point

20 c m

from stonger pole.

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At a mid-point.

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At infinity.

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Solution

The correct option is B At a point $20 c m$ from stonger pole.
correct answer is A.

$I = \frac{μ_{0}}{4 π} \frac{m}{x^{2}}$

$\Rightarrow \frac{μ_{0}}{4 π} \frac{10}{x^{2}} = \frac{μ_{0}}{4 π} \frac{40}{(30 - x)^{2}}$

$\Rightarrow (30 - x^{2}) = 4 x^{2}$

$x = 10$

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Two like magnetic poles of strength 10 and 40 SI units are separated by a distance 30cm. The intensity of magnetic field is Zero on the line joining them.

The correct option is B At a point 20cm from stonger pole.correct answer is A.I=μ04πmx2⇒μ04π10x2=μ04π40(30−x)2⇒(30−x2)=4x2x=10

Two like magnetic poles of strength $10$ and $40$ $S I$ units are separated by a distance $30 c m$ . The intensity of magnetic field is Zero on the line joining them.

The correct option is B At a point $20 c m$ from stonger pole.
correct answer is A.

$I = \frac{μ_{0}}{4 π} \frac{m}{x^{2}}$

$\Rightarrow \frac{μ_{0}}{4 π} \frac{10}{x^{2}} = \frac{μ_{0}}{4 π} \frac{40}{(30 - x)^{2}}$

$\Rightarrow (30 - x^{2}) = 4 x^{2}$

$x = 10$