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Magnetism and Matter Chapter 5 MCQ Test 1

Chapter 5

Magnetism and Matter

MCQs Test 1 

Name
1. 
The angle of dip at a place where the horizontal component of earth’s magnetic field equals the vertical component is:
2. 
The lines of force due to earth’s horizontal magnetic field are:
3. 
A uniform magnetic field is obtained in a: .
4. 
The earth behaves as a magnet with magnetic field pointing approximately from the geographic
5. 
The absence of magnetic monopole is explained by .
6. 
The strength of the earth’s magnetic field is .
7. 
Which of the following is correct about magnetic monopole?
8. 
A current carrying loop is placed in a uniform magnetic field in four different orientations as shown in figure. Arrange them in the decreasing order of potential energy.
9. 
The net magnetic flux through any closed surface, kept in a magnetic field is
10. 
S.I. unit of flux is :
11. 
Point out the correct direction of magnetic field in the given figures.
12. 
A magnetic bar of magnetic moment M is placed in the field of magnetic strength B, the torque acting on it is :
13. 
The magnetic lines of force inside a bar magnet:
14. 
A current carrying power line carries current from west to east. What will be direction of magnetic field 1 meter above it?
15. 
The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?
16. 
The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is:
17. 
The magnetic field of earth is due to:
18. 
In a bar magnet, magnetic lines of force are :
19. 
Where on the earth’s surface is the value of vertical component of earth’s magnetic field zero?
20. 
A magnetic needle, free to rotate in a vertical plane, orients itself vertically at a certain place on the Earth.
21. 
How does the (i) pole strength and (ii) magnetic moment of each part of a bar magnet change if it is cut into two equal pieces transverse to length?
22. 
A hypothetical bar magnet (AB) is cut into two equal parts. One part is now kept over the other, so that the pole C2 is above C1. If M is the magnetic moment of the original magnet, what would be the magnetic moment of the combination, so formed?
23. 
What should be the orientation of a magnetic dipole in a uniform magnetic field so that its potential energy is maximum?
24. 
Horizontal component of earth’s magnetic field at a place is √3 times its vertical component. What is the value of angle of dip at that place?
25. 
The horizontal component of earth’s magnetic field at a given place is 0.4 × 10^–4 Wb/m^2 and angle of dip is 30°. Calculate the value of (i) Vertical component (ii) Total intensity of earth’s magnetic field.
26. 
The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°. What is the value of vertical component of earth’s magnetic field at equator?
27. 
A small magnet is pivoted to move freely in the magnetic meridian. At what place on earth’s surface will the magnet be vertical?
28. 
At a place, the horizontal component of earth’s magnetic field is B and angle of dip is 60°. What is the value of horizontal component of the earth’s magnetic field at equator?
29. 
A magnetic needle, free to rotate in a vertical plane, orients itself vertically at a certain place on the Earth.
30. 
What is the angle of dip at a place where the horizontal and vertical components of the Earth’s magnetic field are equal?
31. 
A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip down at 60° with the horizontal. The horizontal component of the earth’s magnetic field at the place is known at to be 0.4 G. Determine the magnitude of the earth’s magnetic field at the place.
32. 
A magnetised needle of magnetic moment 4.8 × 10^–2 J / T is placed at 30° with the direction of uniform magnetic field of magnitude 3 × 10^–2 T. Calculate the torque acting on the needle.
33. 
Three students represent the variation of magnetic field B with distance r for a straight infinity long current carrying conductor as
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