Magnetic Field and Field Lines
Physics ⇒ Electricity and Magnetism
Magnetic Field and Field Lines starts at 8 and continues till grade 12.
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See sample questions for grade 12
A proton moves perpendicular to a uniform magnetic field. What is the shape of its path?
A student places a compass near a current-carrying wire. The needle deflects. What does this indicate about the space around the wire?
Describe the effect on the magnetic field inside a solenoid if the current is doubled.
Describe the pattern of magnetic field lines around a straight current-carrying conductor.
A bar magnet is placed in a uniform magnetic field. Which of the following will NOT change?
(1) The torque on the magnet
(2) The potential energy of the magnet
(3) The magnitude of the magnetic field
(4) The direction of the magnetic field
A circular coil of radius 0.05 m has 20 turns and carries a current of 3 A. Calculate the magnetic field at its center. (μ₀ = 4π × 10⁻⁷ T·m/A)
A proton moves perpendicular to a uniform magnetic field. What is the shape of its path?
A solenoid has 1000 turns per meter and carries a current of 2 A. Calculate the magnetic field inside the solenoid. (μ₀ = 4π × 10⁻⁷ T·m/A)
A bar magnet is placed in a uniform magnetic field. Which of the following will NOT change?
(1) The torque on the magnet
(2) The potential energy of the magnet
(3) The magnitude of the magnetic field
(4) The direction of the magnetic field
Which of the following best describes the shape of the magnetic field lines around a bar magnet?
(1) Straight lines
(2) Concentric circles
(3) Closed curves from north to south outside the magnet
(4) Random lines
Which of the following factors does NOT affect the strength of the magnetic field inside a solenoid?
(1) Number of turns per unit length
(2) Current through the solenoid
(3) Length of the solenoid
(4) Permeability of the core material
Which of the following is NOT a property of magnetic field lines?
(1) They form closed loops
(2) They never intersect
(3) They have direction from south to north outside the magnet
(4) They are closer where the field is stronger
Fill in the blank: The direction of the magnetic field at a point due to a current-carrying conductor can be found using the __________ rule.
Fill in the blank: The magnetic field at the center of a circular loop of radius r carrying current I is given by B = __________.
Fill in the blank: The magnetic field inside a long, straight solenoid is __________.
Fill in the blank: The magnetic field lines due to a straight current-carrying conductor are in the form of __________.
True or False: Magnetic field lines never cross each other.
True or False: The direction of the magnetic field at a point is the direction in which the north pole of a compass needle points.
True or False: The earth’s magnetic field is due to the presence of a giant bar magnet at its center.
True or False: The magnetic field at the center of a circular loop carrying current is directly proportional to the radius of the loop.
