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 11
A bar magnet is placed on a table. If you sprinkle iron filings around it, what pattern will you observe?
A student observes that the magnetic field lines are denser at the poles of a bar magnet than at the center. What does this indicate about the field strength at these locations?
Describe the pattern of magnetic field lines around a pair of bar magnets placed with their unlike poles facing each other.
Explain why two magnetic field lines never intersect each other.
A bar magnet is placed on a table. If you sprinkle iron filings around it, what pattern will you observe?
A solenoid is 0.5 m long and has 1000 turns. If a current of 2 A flows through it, calculate the magnetic field inside the solenoid. (µ₀ = 4π × 10-7 T·m/A)
A student observes that the magnetic field lines are denser at the poles of a bar magnet than at the center. What does this indicate about the field strength at these locations?
Calculate the magnetic field at the center of a circular coil of radius 0.1 m carrying a current of 5 A. (µ₀ = 4π × 10-7 T·m/A)
The magnetic field inside a long, straight solenoid is (1) zero (2) uniform (3) increasing from one end to the other (4) decreasing from one end to the other
The magnetic field lines due to a straight current-carrying conductor are (1) straight lines (2) concentric circles (3) parabolic curves (4) elliptical loops
Which of the following increases the strength of the magnetic field produced by a current-carrying solenoid? (1) Increasing the number of turns (2) Increasing the current (3) Inserting a soft iron core (4) All of the above
Which of the following is NOT a property of magnetic field lines? (1) They never intersect. (2) They form closed loops. (3) They start from the north pole and end at the south pole outside the magnet. (4) They are always straight lines.
Fill in the blank: The direction of the magnetic field produced by a current-carrying straight conductor can be determined by the _______ hand thumb rule.
Fill in the blank: The magnetic field inside a toroid is _______ and outside is _______.
The direction of the magnetic field at a point is defined as the direction in which the _______ pole of a compass needle points at that location.
The magnitude of the magnetic field at a distance r from a long straight current-carrying wire is given by B = _______.
True or False: Magnetic field lines always form closed loops.
True or False: Magnetic field lines can cross each other at a point.
True or False: The earth behaves like a giant bar magnet with its magnetic south near the geographic north pole.
True or False: The magnetic field at the center of a circular loop is directly proportional to the radius of the loop.
