Magnetic field lines

1. Cannot intersect

2. Are always closed curves

3. Can pass through vacuum

4. All of these

Subtopic:  Magnetic Field & Field Lines |
 84%
From NCERT
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A magnetic needle is kept in a non-uniform magnetic field. It experiences:

1. A force and a torque

2. A force but not a torque

3. A torque but not a force 

4. Neither a torque nor a force

Subtopic:  Magnetic Field & Field Lines |
 72%
From NCERT
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Rate of change of torque  with deflection is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when

1. θ=0o 2. θ=45o
3. θ=60o 4. θ=90o

Subtopic:  Magnetic Field & Field Lines |
From NCERT
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Two small bar magnets are placed in a plane. The direction of their dipole moments and the position of magnets are as shown in the figure.

The appropriate direction of the net magnetic field at point 'P' will be indicated by which of the following arrow?

Subtopic:  Magnetic Field & Field Lines |
 61%
From NCERT
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The magnetic lines of force inside a bar magnet are:

1. from south to the north pole.
2. from north to the south pole.
3. not present.
4. intersecting each other.

Subtopic:  Magnetic Field & Field Lines |
 85%
From NCERT
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A toroid of n turns, mean radius R and cross-sectional radius a carries current I. It is placed on a horizontal table taken as XY-plane. Its magnetic moment m:
1. is non-zero and points in the z-direction by symmetry
2. points along the axis of the toroid (\(m = m\vec{\phi}\) )
3. is zero, otherwise, there would be a field falling as \(\frac{1}{r^{3}}\) at Lange distances outside the toroid
4. is pointing radially outwards
Subtopic:  Magnetic Field & Field Lines |
 54%
From NCERT
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Which of the following is the correct representation of magnetic field lines?

 

1. (g), (c)

2. (d), (f)

3. (a), (b)

4. (c), (e)

Subtopic:  Magnetic Field & Field Lines |
 86%
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Which one of the following is correct?

1. The magnetic field lines also represent the lines of force on a moving charged particle at every point.
2. Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.
3. A bar magnet exerts a torque on itself due to its own field.
4. Magnetic field arises due to stationary charges.

Subtopic:  Magnetic Field & Field Lines |
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