Question:

State whether the following statements are true or false.
  1. The field at the centre of a long circular coil carrying current will be parallel straight lines.
  2. A wire with a green insulation is usually the live wire of an electric supply.

Updated On: Nov 6, 2023
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Solution and Explanation

(a) True: A long circular coil is a long solenoid. The magnetic field lines inside the solenoid are parallel lines.
 

(b) False: Live wire has red insulation cover, whereas earth wire has green insulation colour in the domestic circuits.

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Concepts Used:

Magnetic Field

The magnetic field is a field created by moving electric charges. It is a force field that exerts a force on materials such as iron when they are placed in its vicinity. Magnetic fields do not require a medium to propagate; they can even propagate in a vacuum. Magnetic field also referred to as a vector field, describes the magnetic influence on moving electric charges, magnetic materials, and electric currents.

A magnetic field can be presented in two ways.

  • Magnetic Field Vector: The magnetic field is described mathematically as a vector field. This vector field can be plotted directly as a set of many vectors drawn on a grid. Each vector points in the direction that a compass would point and has length dependent on the strength of the magnetic force.
  • Magnetic Field Lines: An alternative way to represent the information contained within a vector field is with the use of field lines. Here we dispense with the grid pattern and connect the vectors with smooth lines.

Properties of Magnetic Field Lines

  • Magnetic field lines never cross each other
  • The density of the field lines indicates the strength of the field
  • Magnetic field lines always make closed-loops
  • Magnetic field lines always emerge or start from the north pole and terminate at the south pole.