Question:
Two equal electric currents are flowing perpendicular to each other as shown in the figure.
AB and CD are perpendicular to each other and symmetrically placed with respect to the currents.
Where do we expect the resultant magnetic field to be zero?
Two equal electric currents are flowing perpendicular to each other as shown in the figure.
AB and CD are perpendicular to each other and symmetrically placed with respect to the currents.
Where do we expect the resultant magnetic field to be zero?
Updated On: Jun 9, 2024
- On CD
- On AB
- On both OD and BO
- On both AB and CD
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The Correct Option is B
Solution and Explanation
The direction of the magnetic field, due to current, is given by the right-hand rule. At axis AB, the components of magnetic field will cancel each other and the resultant magnetic field will be zero.
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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.