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 10
A compass needle placed near a bar magnet points in a certain direction. What does this indicate about the magnetic field at that point?
A solenoid is a coil of wire with many turns. What is the nature of the magnetic field inside a long solenoid?
A straight conductor carries a current of 5 A. What is the direction of the magnetic field at a point above the wire if the current flows from south to north?
A student increases the number of turns in a coil while keeping the current constant. What happens to the magnetic field at the center of the coil?
A straight conductor carries a current of 5 A. What is the direction of the magnetic field at a point above the wire if the current flows from south to north?
A student increases the number of turns in a coil while keeping the current constant. What happens to the magnetic field at the center of the coil?
A student observes that the magnetic field lines are denser at the ends of a bar magnet. What does this indicate?
A student places a bar magnet under a sheet of paper and sprinkles iron filings on top. What pattern will the filings form and why?
Which of the following best describes magnetic field lines?
(1) They are real lines that can be seen with the naked eye.
(2) They are imaginary lines used to represent the direction and strength of a magnetic field.
(3) They are electric field lines.
(4) They are lines of force in a gravitational field.
Which of the following correctly represents the direction of magnetic field lines inside a bar magnet?
(1) From north to south
(2) From south to north
(3) In random directions
(4) They do not exist inside the magnet
Which of the following factors does NOT affect the strength of the magnetic field around a straight current-carrying conductor?
(1) The amount of current
(2) The distance from the conductor
(3) The material of the conductor
(4) The length of the conductor
Which of the following instruments is used to plot magnetic field lines?
(1) Voltmeter
(2) Ammeter
(3) Compass
(4) Galvanometer
Fill in the blank: The direction of the magnetic field at a point is the direction in which the ________ pole of a compass needle points.
Fill in the blank: The magnetic field at the center of a circular loop carrying current is ________ to the plane of the loop.
Fill in the blank: The magnetic field outside a bar magnet emerges from the ________ pole and enters the ________ pole.
Fill in the blank: The magnetic field strength at the center of a circular coil is directly proportional to the ________ passing through it.
True or False: Magnetic field lines always form closed loops.
True or False: Magnetic field lines intersect each other at right angles.
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 inside a bar magnet runs from the north pole to the south pole.
