JEE Main 2013 Physics question
One of the two small circular coils, (none of them having any self - inductance) is suspended with a V-shaped copper wire, with plane horizontal. The other coil is placed just below the first one with plane horizontal. Both the coils are connected in series with a dc supply. The coils are found to attract each other with a force. Which one of the following statements is incorrect?
Answer: (4)
Solution
Parallel coaxial coils carrying currents in the same sense attract (1 correct); with ac the currents reverse together, so the force stays attractive (2 correct). For two coaxial coils well separated, each behaves as a magnetic
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