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Questions and Answers
What is the right-hand thumb rule used for?
What is the right-hand thumb rule used for?
Determining the direction of magnetic field lines around a current-carrying conductor
In which direction do the fingers wrap around a current-carrying conductor when applying the right-hand thumb rule?
In which direction do the fingers wrap around a current-carrying conductor when applying the right-hand thumb rule?
In the direction of the magnetic field lines
What is the direction of the magnetic field at a point directly below a current-carrying horizontal power line?
What is the direction of the magnetic field at a point directly below a current-carrying horizontal power line?
Clockwise in a plane perpendicular to the wire
How does the pattern of the magnetic field lines change as we move away from a current-carrying circular loop?
How does the pattern of the magnetic field lines change as we move away from a current-carrying circular loop?
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Why is the magnetic field produced by a current-carrying circular loop n times as large as that produced by a single turn?
Why is the magnetic field produced by a current-carrying circular loop n times as large as that produced by a single turn?
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Study Notes
Magnetic Field Associated with a Current-Carrying Conductor
- A convenient way to find the direction of magnetic field associated with a current-carrying conductor is given by the Right-Hand Thumb Rule.
Experiment to Demonstrate Magnetic Field
- Connect a copper wire vertically between two points X and Y in series with a battery, a plug, and a key.
- Sprinkle iron filings uniformly on a cardboard and note the current through an ammeter.
- Close the key to allow current to flow through the wire, keeping the copper wire straight.
- Gently tap the cardboard to observe the pattern of iron filings.
Observations and Inferences
- The iron filings align themselves in a pattern of concentric circles around the copper wire.
- These concentric circles represent the magnetic field lines.
- The direction of the magnetic field can be found by placing a compass at a point over a circle and observing the direction of the needle.
- The direction of the north pole of the compass needle gives the direction of the field lines produced by the electric current through the straight wire at that point.
- The direction of magnetic field lines gets reversed if the direction of current through the straight copper wire is reversed.
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Description
This quiz focuses on using the right-hand thumb rule to determine the direction of the magnetic field around a current-carrying conductor. It covers practical application of the rule, involving setting up a circuit, using iron filings, and measuring current.
