Created by Arghya Sen The magnetic field at a point due to a semi-infinite straight wire, measured along the perpendicular from the point to the near end of the wire, is . A point lying along the extension of a wire experiences zero field from that wire.
An infinitely long conductor PQR is bent to form a right angle, with current flowing through the path PQ and QR. The magnetic field due to this current at a point (located perpendicular to PQ at the bend) is . Now another infinitely long straight conductor QS is connected at Q (collinear with PQ, extending in the opposite direction), so that the current becomes in QR as well as in QS, while the current in PQ remains unchanged at . The magnetic field at is now . What is the ratio ?
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← A uniform magnetic field B = 4×10⁻³ k̂ T exerts a force F = (4î+3ĵ)×10⁻¹⁰ N on a particle of charge q = 10⁻⁹ C moving in the xy-plane. What is the velocity of the particle?Two very long, thin straight wires lie along the X-axis and Y-axis, each carrying equal current away from the origin O. Lines AB and CD pass through O at 45° to the axes, as shown in the figure (with A, B, C, D in alternate quadrants). On which line is the net magnetic field due to the two wires zero everywhere? →
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