Class10 | NCERT | Magnetic Field due to a Current through a Circular Loop | Science | CBSE |

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Class10 | NCERT | Magnetic Field due to a Current through a Circular Loop | Science | CBSE |
We have so far observed the pattern of the magnetic field lines produced around a current-carrying straight wire. Suppose this straight wire is bent in the form of a circular loop and a current is passed through it. How would the magnetic field lines look like? We know that the magnetic field produced by a current-carrying straight wire depends inversely on the distance from it. Similarly, at every point of a current-carrying circular loop, the concentric circles representing the magnetic field around it would become larger and larger as we move away from the wire (Fig. 13.8). By the time we reach the center of the circular loop, the arcs of these big circles would appear as straight lines. Every point on the wire carrying current would give rise to the magnetic field appearing as straight lines at the center of the loop. By applying the right-hand rule, it is easy to check that every section of the wire contributes to the magnetic field lines in the same direction within the loop.
This rule is also called Maxwell’s corkscrew rule. If we consider ourselves driving a corkscrew in the direction of the current, then the direction of the corkscrew is the direction of the magnetic field.
We know that the magnetic field produced by a current-carrying wire at a given point depends directly on the current passing through it. Therefore, if there is a circular coil having ‘n’ turns, the field produced is ‘n’ times as large as that produced by a single turn. This is because the current in each circular turn has the same direction, and the field due to each turn then just adds up.
Activity 6
• Take rectangular cardboard having two holes. Insert a circular coil having a large number of turns through them, normal to the plane of the cardboard.
• Connect the ends of the coil in series with a battery, a key, and a rheostat, as shown in Fig. 13.9.
• Sprinkle iron filings uniformly on the cardboard.
• Plug the key.
• Tap the cardboard gently a few times. Note the pattern of the iron filings that emerges on the cardboard.
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[@masoodsharief]

1:40, maxwell's corkscrew rule is for the right hand thumb rule and not for this section. Please don't give wrong information

[@SiddharthKumar-rv9zi]

In 2:00, Maxwell's Corkscrew Rule is displayed wrong! The circle at the bottom of the screw is opposite to the motion of the hand!

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same as books lines

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