Magnetic dipole & Earth Magnetism

1.Find The Force between magnetic north pole of strength 1.2N/T and 6.2N/T lying in air at a distance 2cm from each other.

• 1.86x10-3 N
• 2.86x10-3 N
• 3.86x10-3 N
• 4.86x10-3 N

2. Calculate the magnetic Dipole moment associated with a coil of 5 turns having loop area of 1mm ^ 2 and carrying current of 2A

• 2.0x10-5Am ^2
• 1.0x10-5Am ^2
• 3.0x10-5Am ^2
• 4.0x10-5Am ^2

3. A certain place the horizontal component of earth's magnetic field is 0.28G and vertical component is 0.40G , Find Total Earth magnetic Field at this place

• 0.281G
• 0.388G
• 0.488G
• 0.588G

4. SI Unit of magnetic dipole moment is

• Am
• Am ^2
• Am ^3
• None of these

5. At magnetic Poles, the angle of dip is

• 45 degree
• 30degree
• zero
• 90degree

6. A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field.

• magnetic declination
• angle of dip
• horizontal components of earth magnetic Field
• all of these

7. angle between geographic and magnetic meridian at that place is called

• angle of dip
• magnetic declination
• Horizontal components of earth magnetic Field
• None of These

8. Two magnetic poles , one of which is 5 times stronger than the other exert a force of 0.8x10-3kgf on each other , when placed at a distance of 10cm in air , find the strength of each pole.

• 12.52Am , 62.6Am
• 5.52Am , 10.52Am
• 7.52Am, 8.52Am
• none of these

9. angle between Total earth magnetic Field to horizontal component of earth magnetic Field is called

• angle of dip
• magnetic Inclination
• Horizontal Components of magnetic field
• none of these