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 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 solenoid is 50 cm long and has 500 turns. What is the number of turns per meter?
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?
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.
Explain why soft iron is used as the core of an electromagnet.
If the direction of current in a straight conductor is reversed, what happens to the direction of the magnetic field around it?
State Fleming’s left-hand rule.
State the difference between a permanent magnet and an electromagnet.
State the function of a commutator in an electric motor.
What is the direction of the force experienced by a current-carrying conductor placed perpendicular to a uniform magnetic field?
Which law states that the magnitude of the force on a current-carrying conductor in a magnetic field is given by F = BIL sinθ?
Who discovered the magnetic effect of electric current?
