Earth's Magnetism

At which place Earth's magnetic field becomes horizontal?

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.

Earth's magnetic field always has a horizontal component except at

Assertion (A): Earth's magnetic field inside a closed iron box is less as compared to the outside Reason (R ): The magnetic permeability of iron is low

A bar magnet of magnetic moment 2.0 A-m^2 is free to rotate about a vertical axis through its centre. The magnet is released from rest from the east west position. Find the kinetic energy of the magnet as it takes the north south position. The horizontal component of the earth's magnetic field as B=25muT . Earth's magnetic field is from south to north.

A : In earn may nave even reversea the direction of its field several time during its history of 4 to 5 billion years. R: Earth's magnetic field gets weakly' recorded' in certain rocks during solidification.

A plane with a wing span of 18 m flies horizontally at a speed of 800 km/h. The vertical component of the Earth's magnetic field strength is about 40 A/m. Find the voltage across the tips of the wings.

The earth's magnetic field is

The strength of the earth's magnetic field is