Two current-carrying wires with the same current flowing through them are placed one above the other as shown in the figure. If the wires form four regions A, B, C, and D as shown, which region has the strongest magnetic field out of the page?
Correct answer: A. A
- A. A
- B. B
- C. C
- D. D
Explanation
Since the two currents are the same, the magnitude of the magnetic field produced by each current-carrying wire will be the same in each region. Let the two current directions be marked in blue and red as shown. Then, the direction of the magnetic field in each of the regions due to the current will be as mentioned.Magnetic fields are the same, and those directed oppositely will cancel out.Hence, the net magnetic field will be maximum in regions A and D. The magnetic field due to both the current-carrying wire Is directed out of the page in region A.region A has the strongest magnetic field out of the page.
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