The magnetic compass is not useful for navigation near the magnetic poles because
The magnetic field near the poles is zero
The magnetic field near the poles is almost vertical
At low temperature, the compass needle looses its magnetic properties
Neither of the above
Isogonic lines on magnetic map will have
The angle of dip at a place is $40.6°$ and the intensity of the vertical component of the earth's magnetic field $V = 6 \times {10^{ - 5}}$ $Tesla$. The total intensity of the earth's magnetic field $ (I) $ at this place is
The north pole of the earth's magnet is near the geographical
A short magnetic needle is pivoted in a uniform magnetic field of strength $1 \,T.$ When another magnetic field of strength $\sqrt 3 \,T$ is applied to the needle in a perpendicular direction, the needle deflects through an angle $\theta$, where $\theta$ is....$^o$
The horizontal component of the earth's magnetic field at any place is $0.36 \times 10^{-4} Wb / m ^{2}$. If the angle of dip at that place is $60^{\circ}$, then the value of vertical component of the earth's magnetic field will be ........ $\times 10^{-4}\;W b / m^{2}$