Question 2341
{"accessible":false,"alternatives":[{"id":11562,"text":"a magnetic field spatial gradient is required to cause a torque on a\r\nferromagnetic object"},{"id":11563,"text":"the maximum translational force on a ferromagnetic object occurs near the\r\nentrance to the magnet bore"},{"id":11564,"text":"the projectile force on an elongated needle-like ferromagnetic object will be\r\nstronger than the force on a spherical object of similar mass and material"},{"id":11565,"text":"the translational magnetic force only occurs in a magnetic field spatial\r\ngradient"}],"archived":false,"correctAlternativeId":11562,"explanation":"\u003cp\u003eA magnetic field spatial gradient is required to produce the projectile force (it does not occur in a uniform magnetic field). The torque or twisting force will occur in any external magnetic field if the axis of the object differs from that of the external field. There will be a torque on an unaligned ferromagnetic object in both a field gradient and a uniform field.\u003c/p\u003e","id":2341,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2968","nextQuestionPath":"/articles/mri-physics/questions/2340","relatedArticles":[],"alsoUsedIn":[{"id":1342,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1342","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1342"},{"id":1200,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1200","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1200"},{"id":248,"kind":"LiveSchedule","title":"248","link":"https://radiopaedia.org/admin/live_schedules/248"},{"id":152,"kind":"LiveSchedule","title":"152","link":"https://radiopaedia.org/admin/live_schedules/152"},{"id":1267,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1267","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1267"},{"id":1267,"kind":"Course","title":"Imaging Physics Lectures - page 1267","link":"https://radiopaedia.org/courses/imaging-physics-lectures/pages/1267"}],"stem":"\u003cp\u003eWhich is \u003cstrong\u003eFALSE \u003c/strong\u003eregarding the forces produced by an MRI scanner?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2341"}],"attemptsPercentages":[{"alternativeId":"11562","percentage":25},{"alternativeId":"11565","percentage":41},{"alternativeId":"11563","percentage":12},{"alternativeId":"11564","percentage":23}],"promptToLogin":false,"questionManager":false,"articleId":"mri-physics"}