A closed current loop shaped as shown in the figure produces a magnetic field at point o, the center of the two concentric semicircles. The radiuses of two semicircles are R and 2R. What is the magnitude of magnetic field at point O? R 2R (a) What is the magnitude of the magnetic field at the center of the loop? O Hol 2R O Hol 8R O HoI 4R O HoI 8R BR (b) What is the direction of the magnetic field? O Up O Left le O Rigth ne O Into the page O Out of the page
A closed current loop shaped as shown in the figure produces a magnetic field at point o, the center of the two concentric semicircles. The radiuses of two semicircles are R and 2R. What is the magnitude of magnetic field at point O? R 2R (a) What is the magnitude of the magnetic field at the center of the loop? O Hol 2R O Hol 8R O HoI 4R O HoI 8R BR (b) What is the direction of the magnetic field? O Up O Left le O Rigth ne O Into the page O Out of the page
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