Concept explainers
The magnitude and direction of the current in the wire.
Answer to Problem 40P
The current in the wire is
Explanation of Solution
Given:
A compass needle changes its direction from
Earth’s magnetic field is
Formula used:
According to the law of sines,
Calculation:
Considering, both the changes in the magnetic field around the wire is in the Earth’s magnetic field. According to the diagram below, compass needle is moving towards south direction. Thus, the net magnetic field due to wire must be towards south direction.
Using the geometry of the figure, angles are
So,
Since the magnetic field in the wire is facing towards the south direction. Thus, current in the wire will be towards down.
Conclusion:
Thus, the current in the wire is
Chapter 20 Solutions
Physics: Principles with Applications
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