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A coil of shape as shown in the figure is placed in a horizontal magnetic field of 1.956 T esla perpendicular to field 0.01 amp. Current in flowing in the coil. It is free to rotate about axis AB. Mass per unit length of straight wires is lambda and that of circular part is lambda//2 where lambda=2.805gm/cm. What will be its magnitude of angular acceleration at t =0 . |
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Answer» Solution :`tau ="iAB SIN" 90^(@)` `= 10^(-4)` N-m Inertia of the frame about AB `=[(1)/(2) (LAMBDA)/(2)piR(R^(2))+(1)/(3)5lambda(4^(2))+5lambda(4)^(2)+(1)/(3)4LAMBDA(4)^(2)]xx10^(-7)` Where `lambda` will be in gm /CM `= lambdaxx178xx24xx10^(-7)=500xx10^(-7)` So `alpha=2 "RAD"//s^(2)` |
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