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16. ’µ’ is the symbol for
A. permittivity
B. permeability
C. conductivity
D. resistivity
Explanation:
17. The relationship between relative permeability of a medium and permeability of free space is
A. µr = µr  µ0
B. µ = µ0 µr
C. µr = µ0 / µ
D. µ = µ0 / µr
Explanation:
18. The south pole of the earth’s magnetic field
A. is at the centre of the earth
B. lies along the equatorial line
C. lies in the northern hemisphere
D. lies in the southern hemisphere
Explanation:
19. The value of the relative permeability of air is
A. 4π  10-7
B. 0
C. -1
D. 1
Explanation:
20. The north pole of the earth’s magnetic field
A. is at the centre of the earth
B. lies along the equatorial line
C. lies in the northern hemisphere
D. lies in the southern hemisphere
Explanation:
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