Two infinitely long straight wires lie in the xy - plane along the lines x = ± R . The wire located at x = + R carries a constant current I 1 and the wire located at x = - R carries a constant current

Question

Two infinitely long straight wires lie in the xy - plane along the lines x = ± R . The wire located at x = + R carries a constant current I 1 and the wire located at x = - R carries a constant current I 2 . A circular loop of radius R is suspended with its centre at 0 , 0 3 R and in a plane parallel to the xy - plane. This loop carries a constant current I in the clockwise direction as seen from above the loop. The current in the wire is taken to be positive if it is in the + j ^ direction. Which of the following statements regarding the magnetic field B → is (are) true?

TestHub · Accepted Answer

( A ) At origin, B → = 0 due to two wires if I 1 = I 2 , h e n c e B → n e t at origin is equal to B → due to ring, which is non-zero. ( B ) If I 1 > 0 a n d I 2 < 0 , B → at origin due to wires will be along + k ^ direction and B → due to ring is along - k ^ direction and hence B → can be zero at origin ( C ) If I 1 < 0 a n d I 2 > 0 , B → at origin due to wires is along - k ^ and also along - k ^ due to ring, hence B → cannot be zero ( D )

Physics - Magnetism Question with Solution | TestHub

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