Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres 40 cm east and 50 cm west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments M1: M2 is

Question

Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres 40 cm east and 50 cm west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments M1: M2 is (A) 4: 5 (B) 16: 25 (C) 64: 125 (D) 2: √5

Tardigrade Admin · Accepted Answer

For null deflection, (M1/M2)=((d1/d2))3 =((40/50))3=(64/125)

Q. Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres $40 c m$ east and $50 c m$ west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments $M_{1} : M_{2}$ is

$4 : 5$

$16 : 25$

$64 : 125$

$2 : 5$

For null deflection, $\frac{M _{1}}{M _{2}} = (\frac{d _{1}}{d _{2}})^{3}$
$= (\frac{40}{50})^{3} = \frac{64}{125}$

Q. Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres 40cm east and 50cm west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments M1​:M2​ is

4:5

16:25

64:125

2:5​