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13. Figure (34-E17) shows a convex lens of focal length12 em lying in a uniform magnetic field B of magnitude1 2 T parallel to its principal axis. A particle having acharge 2.0 × 10-3 C and mass 2.0 × 10-5 kg is projectedperpendicular to the plane of the diagram with a speedof 4.8 m s1. The particle moves along a circle with itscentre on the principal axis at a distance of 18 em fronmthe lens. Show that the image of the particle goes alonga circle and find the radius of that circle.

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