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 9
A current of 2 A flows through a straight conductor. If the current is reversed, what happens to the direction of the magnetic field?
A solenoid has 500 turns and carries a current of 2 A. If the number of turns is doubled, what happens to the magnetic field inside the solenoid?
A student observes that the needle of a magnetic compass placed near a wire deflects when the wire is connected to a battery. What does this observation indicate?
A wire carries a current of 5 A. If the current is doubled, how does the magnetic field at a fixed distance from the wire change?
Describe the pattern of magnetic field lines around a bar magnet.
Describe what happens when a magnetic compass is placed near a current-carrying wire.
Explain why a soft iron core is used inside a solenoid to make an electromagnet.
A student observes that the needle of a magnetic compass placed near a wire deflects when the wire is connected to a battery. What does this observation indicate?
The direction of the magnetic field around a straight conductor can be determined by which rule? (1) Fleming's Left Hand Rule (2) Right Hand Thumb Rule (3) Lenz's Law (4) Ohm's Law
Which of the following factors does NOT affect the strength of the magnetic field around a straight conductor? (1) Magnitude of current (2) Distance from the wire (3) Material of the wire (4) Length of the wire
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) They are denser where the field is stronger
Which of the following is NOT an application of the magnetic effect of electric current? (1) Electric motor (2) Electric generator (3) Electric heater (4) Electromagnet
Fill in the blank: The device that converts mechanical energy into electrical energy using magnetic effects is called a _________.
Fill in the blank: The device used to detect and measure small electric currents is called a _________.
Fill in the blank: The direction of induced current in a conductor is given by ________ Law.
Fill in the blank: The force on a current-carrying conductor in a magnetic field is given by the formula F = _________.
True or False: The direction of magnetic field lines outside a bar magnet is from north to south.
True or False: The direction of the magnetic field produced by a current-carrying conductor depends on the direction of current.
True or False: The force experienced by a current-carrying conductor in a magnetic field is maximum when the conductor is parallel to the field.
True or False: The magnetic field due to a current-carrying circular loop at its center increases if the radius of the loop is increased, keeping current constant.
