Which of the following correctly describes the magnetic field near a long straight wire?
- The field consists of straight lines perpendicular to the wire.
- The field consists of straight lines parallel to the wire.
- The field consists of radial lines originating from the wire.
- The field consists of concentric circles centred on the wire.
The Correct Option is D
Solution and Explanation
The magnetic field lines, produced around a straight current-carrying conductor, are concentric circles. Their centres lie on the wire.
So, the correct option is (D): The field consists of concentric circles centred on the wire
Top Questions on Magnetic Field And Field Lines
- (i) Mention any two properties of magnetic field lines.
- UP Board X - 2025
- Science
- Magnetic Field And Field Lines
- Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?
- CBSE Class X
- Science
- Magnetic Field And Field Lines
- List two methods of producing magnetic fields.
- CBSE Class X
- Science
- Magnetic Field And Field Lines
Questions Asked in CBSE X exam
- Prove that \(\left(1 + \frac{1}{\tan^2 \theta}\right) \left(1 + \frac{1}{\cot^2 \theta}\right) = \frac{1}{\sin^2 \theta - \sin^4 \theta}\).
- CBSE Class X - 2025
- Trigonometry
- The volume of air in a hollow cylinder is 450 cm\(^3\). A cone of same height and radius as that of cylinder is kept inside it. The volume of empty space in the cylinder is
- CBSE Class X - 2025
- Mensuration
- Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown:
- CBSE Class X - 2025
- Light - Reflection and Refraction
परंपरागत भोजन को लोकप्रिय कैसे बनाया जा सकता है ?
i. उपलब्ध करवाकर
ii. प्रचार-प्रसार द्वारा
iii. बिक्री की विशेष व्यवस्था करके
iv. घर-घर मुफ्त अभियान चलाकर विकल्प:- CBSE Class X - 2025
- गद्यांश पर आधारित प्रश्न
- The distance of the point A($-3$, $-4$) from x-axis is
- CBSE Class X - 2025
- Coordinate Geometry
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.