Maharashtra Board Solutions for Chapter: Magnetism, Exercise 2: Exercises

A place where the horizontal component of Earth's magnetic field is zero lies at 

What is a geographic meridian. How does the declination vary with latitude? Where is it minimum?

Define the Angle of Dip. What happens to angle of dip as we move towards magnetic pole from magnetic equator?

A magnetic pole of bar magnet with pole strength of $100 \mathrm{A} \mathrm{m}$ is $20 \mathrm{cm}$ away from the centre of a bar magnet. Bar magnet has pole strength of $200 \mathrm{A} \mathrm{m}$ and has a length $5 \mathrm{cm}$. If the magnetic pole is on the axis of the bar magnet, the force on the magnetic pole is $....... \times {10}^{-2} \mathrm{N}$.

A magnet makes an angle of ${45}^{°}$ with the horizontal in a plane making an angle of ${30}^{°}$with the magnetic meridian. Find the true value of the dip angle at the place.

A circular magnet is made with its north pole at the centre, separated from the surrounding circular South Pole by an air gap. Draw magnetic field lines in the gap. Draw a diagram to illustrate the magnetic lines of force between the south poles of two such magnets.

Two small and similar bar magnets have magnetic dipole moment of $1.0 \mathrm{A} {\mathrm{m}}^2$ each. They are kept in a plane in such a way that their axes are perpendicular to each other. A line drawn through the axis of one magnet passes through the centre of the other magnet. If the distance between their centres is $2 \mathrm{m}$, the magnitude of magnetic field at the mid point of the line joining their centres is $\sqrt{x}\times {10}^{-7} \mathrm{Wb} {\mathrm{m}}^{-2}$. Write the value of $x$.

(Take ${\mu }_0=4\pi \times {10}^{-7} \mathrm{H} {\mathrm{m}}^{-1}$)

Two bar magnets are placed on a horizontal surface. Draw magnetic lines around them. Mark the position of any neutral points (points where there is no resultant magnetic field ) on your diagram.