1 The earth being assimilated to a bar magnet, t earth corresponds approximately
ID: 776873 • Letter: 1
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1 The earth being assimilated to a bar magnet, t earth corresponds approximately to he geographic North pole of the a) A magnetic North pole of the bar magnet b) A magnetic South pole of the bar magnet c) Not enough information to say 2. The SI unit of magnetic flux is the a) weber b) gauss c) tesla d) lorentz 3. If the distance between the poles of two long bar magnets is reduced by a factor of three, then the magnetic force between the two magnets a) increases by a factor of three b) increases by a factor of nine c) decreases by a factor of three d) decreases by a factor of nine 4. A circula r loop of radius 10 cm is rotating in a uniform magnetic field of 3 Tesla. The magnetic flux through the loop when the plane of the loop and the magnetic field are perpendicular is a) zero b) 0.0942 Wb c) 0.942 Wb d) another value 5. A moveable current element of length 40 cm is placed in a region where the magnetic field is 1 Tesla and making an angle of 30° with the current element. The current is 2 A. The force on the moveable current element is a) 8N b) 40N )0.4N d) another value 6. Faraday's law of induction states that the emf induced in a loop of wire is proportional to a) the magnetic flux b) the rate of change with time of the magnetic flux c) the magnetic flux density times the loop's area d) current divided by time 7. The flux through a coil changes from 2.0x 103 Wb to 5.0x 1 03 Wb in 0.10 s. What emf is induced in this coil? a) 5,0 x 104 v b) 3.0 x 104 v c) 2.0 x 104 v d) None of the aboveExplanation / Answer
The geographic North pole corresponds to the magnetic SOUTH pole.
Hence option (b) is correct.
2 SI unit of magnetic flux is Weber.
3.
Force is inversely proportional to square distance (r)
F ~1/r^2
If r' = r/3
Then F' = 9 F
Option (b) is correct.
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