Question 148: Magnetism and Matter

Question

In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 $$	imes$$ 10
$$-$$2
A/m
2
and moment of inertia 5 $$	imes$$ 10
$$-$$6
kg m
2
. If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take $$\pi$$
2
as 9.85]

Accepted Answer

$$T = 2\pi \sqrt {{I \over {MB}}} $$
B = 80 $$	imes$$ 10
$$-$$4
= 8 mT

Magnetism and Matter

In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 $\times 10 -2 A/m 2 and moment of inertia 5 \times 10 -6 kg m 2 . If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take \pi$ 2 as 9.85]

Integer / Numeric Answer Type