Earth - a gigantic magnet - class-VIII
Description: earth - a gigantic magnet | |
Number of Questions: 23 | |
Created by: Girish Goud | |
Tags: physics properties of a magnetic field magnetism magnetism and electromagnetism |
The magnetic south pole of the earth is situated near the
State whether true or false:
The shape of the earth's magnetic field resembles that of an imaginary
The angle of declination at a place is the angle
It is a common notion that the earth's magnetism is due to the
Even though earth is a giant magnet, all the iron does not stick to it at north and south pole because
AN iron rod burried inside earth along direction becomes a magnet
The bulging of earth at the equator and flattening at the poles is due to
Define angle of declination at a place :
Assertion : Earth's magnetic field does not affect the working of a moving coil galvanometer.
Reason : The earth's magnetic field is quite weak as compared to magnetic field produced in the moving coil galvanometer.
The north pole of earth's magnet is near __________.
A magnet is placed earth's magnetic field with south pole of the magnet pointing north. At the neutral point :
The magnetic field of earth is due to :
A body of mass 100 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 $m/s^2$. Air friction is negligible.
A ball 'A' of mass m falls to the surface of the earth from infinity. Another ball 'B' of mass 2m falls to the earth from the height equal to six times radius of the earth then ratio of velocities of 'A' and 'B' on reaching the earth is
The value of g decreases inside the surface of Earth because
The height at which the weight of a body becomes $1/16^{th}$, its weight on the surface of earth (radius R), is :-
The actual north magnetic pole of earth
Atoms or molecules of liquid or gaseous mate-rial are in rapid motion and are not aligned. Thus,
When a Magnetic needle is suspended freely, it always aligns itself in the direction of magnetic north and south pole of the earth, the north pole of the needle gets attracted towards the magnetic south pole of the earth and the south gets repelled equally away from it. So two equal and opposite forces acting on the needle should cancel each other which does not happen because the:
The place where the angle of dip is 90 are known as
The north pole of earth's magnet is near
The earth's field departs from its dipole shape substantially at large distance (greater than about $3000$ km). The responsible factor for this distortion is then