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 9
A bar magnet is cut into two equal pieces. What happens to the magnetic field lines?
A solenoid is connected to a battery. What will happen to the magnetic field inside the solenoid if the current is doubled?
A student increases the number of turns in a solenoid while keeping the current constant. What effect does this have on the magnetic field inside the solenoid?
A student observes that iron filings arrange themselves in a pattern around a bar magnet. What does this pattern represent?
A bar magnet is cut into two equal pieces. What happens to the magnetic field lines?
A solenoid is connected to a battery. What will happen to the magnetic field inside the solenoid if the current is doubled?
A student increases the number of turns in a solenoid while keeping the current constant. What effect does this have on the magnetic field inside the solenoid?
A student observes that iron filings arrange themselves in a pattern around a bar magnet. What does this pattern represent?
Which of the following best describes magnetic field lines?
(1) They are real lines visible to the naked eye.
(2) They are imaginary lines used to represent the direction and strength of a magnetic field.
(3) They are electric currents.
(4) They are gravitational forces.
Which of the following factors does NOT affect the strength of the magnetic field produced by a solenoid?
(1) Number of turns
(2) Current through the solenoid
(3) Length of the solenoid
(4) Color of the wire
Which of the following increases the strength of the magnetic field inside a 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 cross each other.
(2) They always form closed loops.
(3) They start from the south pole and end at the north pole outside the magnet.
(4) Their density indicates the strength of the magnetic field.
Fill in the blank: The direction of the magnetic field produced by 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 directly proportional to ________.
Fill in the blank: The magnetic field due to a straight current-carrying conductor at a point is inversely proportional to the ________ from the wire.
Fill in the blank: The magnetic field inside a long, straight solenoid is ________ (uniform/non-uniform).
True or False: Magnetic field lines always form closed loops.
True or False: Magnetic field lines are denser where the magnetic field is stronger.
True or False: Magnetic field lines never intersect each other.
True or False: The direction of the magnetic field at a point can be determined by the direction in which the north pole of a compass needle points.
