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12th ICSE
IMPORTANT
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Two small magnets are placed along a straight line at a distance of 20 cm from each other and their north poles are facing each other. If their magnetic moments be 0.20 and 0.40 JT-1 then find the magnetic field at the middle-point between them.

Important Questions on Magnetic Field and Earth's Magnetism

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12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 8
Two mutually perpendicular lines are drawn on a table. Two small magnets, whose magnetic moments are 0.108 and 0.192 J T-1, are placed on these lines. If the distance of the point of intersection of these lines be respectively 30 and 40cm from these magnets, then find the resultant magnetic field at the point of intersection.
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12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 9
The horizontal component of earth’s magnetic field at a place is 3 times the vertical component. What is angle of dip at that place?
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12th ICSE
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NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 10
If the ratio of the horizontal component of earth’s magnetic field to the resultant magnetic field at a place is 12, what is the angle of dip at that place?
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12th ICSE
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NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 11
A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 60° with the horizontal. The horizontal component of earth’s magnetic field is 0.3 x 10-4 Wb/m2. Find the vertical component and total magnetic field of earth.
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12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 12
A magnetic needle free to rotate about the vertical direction (compass) points 3.5° west of the geographic north. Another magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian (dip needle) has its north tip pointing down at 18° with the horizontal. The horizontal component of earth’s magnetic field at the place is 0.40 G. Find the magnitude and direction of the earth’s magnetic field B→Eat the place tan18°=0.325
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12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 13
A short bar-magnet is placed with its north pole pointing north. The neutral point is 10 cm away from the centre of the magnet. If BH = 0.4 G, calculate the magnetic moment of the magnet. 
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12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 14
The magnetic moment of a small magnet is 4.8 A m2. It is kept in earth’s magnetic field in magnetic meridian with its north pole pointing towards geographical south. The neutral points are situated at a distance of 30 cm from the centre of the magnet. Calculate the horizontal component of the earth’s magnetic field.
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12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 15
A small bar-magnet is placed in a horizontal plane with its axis in the magnetic meridian. Neutral points are obtained on its equatorial line at 12.5 cm  from the centre of the magnet. The earth’s magnetic field at the place is 0.38 G and the angle of dip is zero, (a) Find the total magnetic field on the axis of the magnet at 12.5 cm from the centre of the magnet,