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Tangent Law And Galvanometer - Questions and Answers

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11. Magnetic intensity due to a bar magnet of length 2l and pole strength ‘m’ at an equatorial point at a distance ‘d’ from the mid-point is
A. µ0/4π . Md/(d2+l2 )3/2
B. µ0/4π . 2Md/(d2+l2 )3/2
C. µ0/4π . M/(d2+l2 )3/2 parallel to axis directed N ⃗S
D. µ0/4π . M/(d2+l2 )3/2 parallel to axis directed S ⃗N
Explanation:
12. A coil of 100 turns and area 0.5 m2 has its plane perpendicular to a uniform magnetic field of induction 0.2m Wb/ m2.Then magnetic flux through the coil is
A. zero
B. 0.1 Wb
C. 1 Wb
D. 10 Wb
Explanation:
13. A magnetic needle suspended at a place having two magnetic fields comes to rest when
A. two fields are at right angle
B. one of the field coincides with earth’s magnetic field
C. couples acting on the needle are equal and opposite
D. the needle is around 45°
Explanation:
14. For a short magnet placed along the arms of deflection magnetometer in TanA position
A. 2M/d3 tan θ  10-7 = B
B. M/B  107 = d3 tan θ
C. M = d3 B tan θ  107
D. M/B = d3/2 . tan θ  107
Explanation:
15. If the reduction factor of a tangent galvanometer is 900mA, then the current that produces a deflection of 30° in it is
A. 400mA
B. 520A
C. 450A
D. 520mA
Explanation:
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