SOME NUMERICALS MAGNETISM & MATTER(XII)

NUMERICALS (MAGNETISM & MATTER)

1. Two like magnetic poles of strength 5AM & 20 AM are situated 1m apart. At what point on the line joining the poles, will be zero.

2. Two short magnets P & Q are placed one over another with their magnetic axes mutually perpendicular to each other. It is found that the resultant field at a point on the prolongation of magnetic axis of P is inclined at 30' with the axis compare the magnetic moment of two magnet.

3. A magnetic steel wire 31.4 cm long has a pole strength of 0.2 AM. It is bent in the form of a semicircle. calculate the magnetic moment of the steel wire.

4. A magnetic Poles one of which is 10 times as strong as the other exert on each other a force equal to 9.604 mN, when placed 10 cm apart in air. Find the strength of the two poles.

5. If the horizontal component of earth's magnetic field at a place where the angle of Dip is 60' is 0.4*10^-4 T, calculate the vertical component and the resulting magnetic field  at the place. 

6. The declination at a place is 15' west of north. In which direction should a ship be stressed with respect to compass needle so that it reaches the place due to east?

7. A ship is to reach a place 10' South of west. In which direction should it be stressed with respect to compass needle. If the declination at the place is 18' west to north?

8. A ship is sailing due east according to mariner's compass. If the declination of the place of 18' east of north , what is the true direction of the ship?

9. The horizontal & vertical components of earths field at a place are 0.28 G & 0.38 G respectively. Calculate the angle of dip & resultant intensity of earth's field.

10. The horizontal component of earth's magnetic field is 0.2 G & total magnetic field is 0.4 G. Find the angle of Dip?