Question: What happens to the magnetic field strength if the distance from a long straight wire is tripled?
Options:
Increases by 3 times
Decreases by 3 times
Decreases by 9 times
Remains the same
Correct Answer: Decreases by 9 times
Solution:
The magnetic field strength decreases with the square of the distance from the wire.
What happens to the magnetic field strength if the distance from a long straight
Practice Questions
Q1
What happens to the magnetic field strength if the distance from a long straight wire is tripled?
Increases by 3 times
Decreases by 3 times
Decreases by 9 times
Remains the same
Questions & Step-by-Step Solutions
What happens to the magnetic field strength if the distance from a long straight wire is tripled?
Step 1: Understand that a long straight wire creates a magnetic field around it.
Step 2: Know that the strength of this magnetic field depends on the distance from the wire.
Step 3: Remember the rule: the magnetic field strength decreases as you move away from the wire.
Step 4: If you triple the distance from the wire, you are moving further away.
Step 5: The strength of the magnetic field decreases by the square of the distance. This means if you triple the distance, the strength becomes 1/(3^2) or 1/9 of the original strength.
Step 6: Conclude that tripling the distance reduces the magnetic field strength to one-ninth of what it was.
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