Magnetic Effects Of Electric Current

15 Questions | Total Attempts: 3897

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Magnetic Effects Of Electric Current

Time: 30 Minute


Questions and Answers
  • 1. 
    The magnetic field lines produced by a bar magnet:
    • A. 

      Originate from the South pole and end at its North Pole

    • B. 

      Originate from the North pole and end at its East Pole

    • C. 

      Originate from the North Pole and end at its South Pole

    • D. 

      Originate from the South pole and end at its West Pole

  • 2. 
    The north pole of Earth’s magnet is in the:
    • A. 

      Geographical South

    • B. 

      Geographical East

    • C. 

      Geographical West

    • D. 

      Geographical North

  • 3. 
    A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:
    • A. 

      Will decrease

    • B. 

      Will increase

    • C. 

      Will become zero

    • D. 

      Will remain the same

  • 4. 
    A current carrying conductor is held in exactly vertical direction. Inorder to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
    • A. 

      From top towards bottom

    • B. 

      From left towards right

    • C. 

      From bottom towards top

    • D. 

      From right towards left

  • 5. 
    The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is:
    • A. 
    • B. 
    • C. 
    • D. 
  • 6. 
    An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
    • A. 

      The speed with which the magnet is moved

    • B. 

      The number of turns of the coil

    • C. 

      The resistivity of the wire of the coil

    • D. 

      The strength of the magnet

  • 7. 
    A car headlamp of 48 W works on the car battery of 12 V. The correct fuse for the circuit of this car headlamp will be:
    • A. 

      3 A

    • B. 

      5 A

    • C. 

      10 A

    • D. 

      13 A

  • 8. 
    A constant current flows in a horizontal wire in the plane of the paper from east to west as shown below, the direction of magnetic field at a point will be north to south:
    • A. 

      Directly above the wire

    • B. 

      Directly below the wire

    • C. 

      At a point located in the plane of the paper, on the north side of the wire

    • D. 

      At a point located in the plane of the paper, on the south side of the wire

  • 9. 
    If two circular coils can be arrange in any of the tree situations shown in the diagram below, then their mutual induction will be:
    • A. 

      Maximum in situation (a)

    • B. 

      Maximum in situation (b)

    • C. 

      Maximum in situation (c)

    • D. 

      The same in all situations

  • 10. 
    A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is: A: Held stationary B: Moved away along its axis C: Moved towards along its axis There will be induced current in:
    • A. 

      A only

    • B. 

      A and B only

    • C. 

      B and C only

    • D. 

      A, B and C

  • 11. 
     An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure. What is your observation?
    • A. 

      The needle will not deflect

    • B. 

      Only one of the needles will deflect

    • C. 

      Both the needles will deflect in the same direction

    • D. 

      The needles will deflect in the opposite directions

  • 12. 
    A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid:
    • A. 

      Will become zero

    • B. 

      Will decrease

    • C. 

      Will increase

    • D. 

      Will remain unaffected

  • 13. 
    • A. 
    • B. 
    • C. 
    • D. 
  • 14. 
    A 3-pin mains plug is fitted to the cable for a 1kW electric cable to be used on a 250 V ac supply. Which of the following statement is not correct?
    • A. 

      A fuse should be fitted in a live wire

    • B. 

      A 13 A fuse is the most appropriate value to use

    • C. 

      The neutral wire is coloured black

    • D. 

      The green wire should be connected to the earth pin

  • 15. 
    A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below: The force on the wire due to the magnet is directed:
    • A. 

      From N to S

    • B. 

      From S to N

    • C. 

      Vertically downwards

    • D. 

      Vertically upwards