Magnetic Effects of Electric Current
Physics ⇒ Electricity and Magnetism
Magnetic Effects of Electric Current starts at 9 and continues till grade 12.
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See sample questions for grade 10
A wire carries a current of 2 A. If the direction of current is from south to north, what is the direction of the magnetic field at a point directly above the wire?
Describe the effect on the magnetic field produced by a current-carrying solenoid if the current is doubled.
Describe the working principle of an electric motor.
Explain why a current-carrying conductor produces a magnetic field around it.
A current of 5 A flows through a circular coil of 20 turns and radius 10 cm. What is the total length of wire used to make the coil?
A rectangular coil of area 0.02 m² and 100 turns is placed perpendicular to a magnetic field of 0.5 T. If the coil is rotated by 90°, what is the change in magnetic flux?
A straight conductor of length 0.5 m is placed perpendicular to a magnetic field of 0.2 T. If a current of 3 A flows through it, what is the force experienced by the conductor?
A wire carries a current of 2 A. If the direction of current is from south to north, what is the direction of the magnetic field at a point directly above the wire?
Which of the following devices works on the principle of the magnetic effect of electric current?
(1) Electric bell
(2) Electric heater
(3) Electric fan
(4) Electric bulb
Which of the following factors does NOT affect the strength of the magnetic field produced by a current-carrying solenoid?
(1) Number of turns per unit length
(2) Current through the solenoid
(3) Length of the solenoid
(4) Nature of the core material
Which of the following increases the strength of an electromagnet?
(1) Increasing the number of turns of the coil
(2) Increasing the current through the coil
(3) Using 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 south pole and end at the north pole.
(4) Their density indicates the strength of the magnetic field.
Fill in the blank: The device used to detect and measure small electric currents is called a _______.
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 inside a long straight solenoid carrying current is _______.
Fill in the blank: The SI unit of magnetic field strength is _______.
True or False: The direction of the induced current is such that it opposes the change that produced it, according to Lenz’s law.
True or False: The direction of the magnetic field around a straight current-carrying conductor can be determined by the right-hand thumb rule.
True or False: The earth behaves like a huge bar magnet with its magnetic south near the geographic north pole.
True or False: The strength of the magnetic field inside a solenoid increases if the number of turns per unit length is increased.
