Two magnetic poles one of which is three times as strong as the other exert on each other- a force equal to 3-10-3 when separated by a distance of 10 cm- The strength of the each pole is

The force between two magnetic poles is $F$ when they are separated by certain distance. If the distance between the two poles is doubled and strength of each pole is tripled. The percentage change in the force between the two poles is :

Q. Two point charges, five time as strong as the other repel each other with a force of

1.8 \times 10^{3}

N. When separated by a distance 1 m, calculate the value of charges?

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Two magnetic poles one of which is three times as strong as the other exert on each other, a force equal to 3×10−3 when separated by a distance of 10 cm. The strength of the each pole is

The correct option is B 30 Am,10 AmLet m1=3m2F=μ04πm1m2r2=10−7×3m22/(0.1)2=3×10−3N⇒3m22=300∴m2=10 Am,m1=30 Am

Two magnetic poles one of which is three times as strong as the other exert on each other, a force equal to $3 \times 10^{- 3}$ when separated by a distance of $10 c m$ . The strength of the each pole is

The correct option is B $30 A m, 10 A m$
Let $m_{1} = 3 m_{2}$
$F = \frac{μ_{0}}{4 π} \frac{m_{1} m_{2}}{r^{2}} = 10^{- 7} \times 3 m_{2}^{2} / (0.1)^{2} = 3 \times 10^{- 3} N$
$\Rightarrow 3 m_{2}^{2} = 300$
$∴ m_{2} = 10 A m, m_{1} = 30 A m$