Which of the following correctly describes the magnetic field near a long straight wire?
NCERT Solution for Class 10 Science Chapter 13
Magnetic Effects of Electric Current
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-240
Questions No-1
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The correct description of the magnetic field near a long straight wire is given by the right-hand rule. According to the right-hand rule:
1. Direction of the Magnetic Field:
If you point your thumb in the direction of the current flow (the conventional current flow, from positive to negative), and your fingers in the direction of the current (from positive to negative), then your curled fingers represent the direction of the magnetic field around the wire.
2. Circular Magnetic Field Lines:
The magnetic field forms concentric circles around the wire. The strength of the magnetic field decreases as you move farther away from the wire.
So, to summarize, the magnetic field near a long straight wire forms circular loops around the wire, and the direction of these loops is determined by the right-hand rule. The magnetic field strength is directly proportional to the current flowing through the wire.
(d) The magnetic field lines, produced around a straight current-carrying conductor, are concentric circles. Their centres lie on the wire.
(d) The field consists of concentric circles centred on the wire.
On applying right-hand thumb rule, we find the direction of magnetic field. The field is in the form of concentric circles centred on the wire carrying current.
Hence, the option (d) is correct.
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