https://foxoyo.com/mcq/42664/a-length-of-wire-carries-a-steady-current-it-is-bent-to-form-a-circular-coil-of-one-turn-only-the-same-length-is-now-bent-more-sharply-to-give-a-double-loop-of-smaller-radius-the-magnetic-field-at-the-centre-caused-by-the-same-current-is