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1. What is the angle of dip at a place where horizontal component of earth's magnetic field is equal to the vertical component?
A. 30°
B. 90°
C. 45°
D. 0°
3. Which one of the Maxwell's laws leads to the conclusion that there are no magnetic field loops that are not closed?
A. Faraday's law
B. Gauss' law for magnetism
C. Gauss' law for electricity
D. Ampere-Maxwell law
4. What is the relation between dipole moment pm, volume of bar magnet V and intensity of magnetization M?
A. A
B. B
C. C
D. D
5. If we place a bar magnet in the magnetic meridian with its north pole towards geographic north, the neutral point will be:
A. on the axial of the magnet
B. at 45° with the axial line
C. at 45° with the equatorial line
D. on the equatorial line of the magnet
7. Magnetic field strength due to a short bar magnet on its axial line at a distance x is B. What is its value at the same distance on the equatorial line?
A. B/2
B. B
C. 2B
D. 4B
9. If the magnet is suspended at an angle 30° to the magnetic meridian, the dip needle makes an angle 60o with the horizontal. What is the true dip?
A. tan-1 (3)
B. tan-1 (3/2)
C. tan-1 (2/3)
D. tan-1 (1/3)
10. A compass has a small balanced pointer that always points North-South. This is because:
A. Gravity makes the needle point this way
B. the earth has a magnetic field and the pointer is magnetic
C. the stars exert a force on the needle
D. the compass needle points to cold places
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