PhysicsHardHigh School (11–12)Electricity & Magnetism › Magnetic Effects of CurrentNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabA wire carrying a current forms each circular arc below, centred on the point O. Straight leads lie along lines through O. Match each arc with the magnitude of the field at O. List-I (Arc) A. A complete circle of radius B. A semicircle of radius C. A quarter of a circle, of radius D. Three quarters of a circle, of radius List-II (Field at O) I. II. III. IV.
← All Quizzes
← The figure shows hysteresis loops of two ferromagnetic materials, X and Y. Six statements follow.
(i) Y has the larger coercivity.
(ii) Y has the larger retentivity.
(iii) Y loses less energy per cycle than X.
(iv) X suits a transformer core better than Y.
(v) Y suits a permanent magnet better than X.
(vi) X keeps no induction once H is reduced to zero.
How many of the statements above are correct?The figure shows three loops, U, V and W, made from equal lengths of the same wire: a circle, a square and an equilateral triangle. Each carries the same current. Each is placed in turn in the same uniform magnetic field, with its plane parallel to the field. Compare the torques τU, τV and τW on the loops. Which option is correct? →
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