Consider the following statements about magnetic field at a point due to a current carrying straight conductor.

(a) It increases as the current in the conductor increases.

(b) It decreases as the distance of the point from the conductor increases.

(c) Its direction can be determined by Right-hand Thumb rule'.

Which of the statement(s) is/are correct?

The correct answer is All (a), (b) and (c).

Key Points

• The magnetic field around a current-carrying straight conductor increases as the current in the conductor increases.
• The magnetic field decreases as the distance from the conductor increases.
• The direction of the magnetic field can be determined using the Right-hand Thumb rule.
• According to the Right-hand Thumb rule, if you grip the conductor with your right hand with the thumb pointing in the direction of the current, the direction in which your fingers curl gives the direction of the magnetic field lines.
• The magnetic field lines form concentric circles around the conductor.

Additional Information

• Biot-Savart Law
  • This law helps in calculating the magnetic field produced by a segment of current-carrying conductor.
  • It states that the magnetic field is directly proportional to the current and inversely proportional to the distance from the conductor.
• Magnetic Field Lines
  • These are visual representations of the magnetic field around a conductor or magnet.
  • They illustrate the direction and strength of the magnetic field.
• Electromagnetic Induction
  • This is the process of generating electric current by changing the magnetic field around a conductor.
  • It is the fundamental principle behind transformers and generators.