An electromagnetic doorbell has been constructed by wrapping 66 turns of wire ar

Question

An electromagnetic doorbell has been constructed by wrapping 66 turns of wire around a long, thin rod, as shown in the figure. The rod has a mass of 34 g, a length of 8 cm, and a cross-sectional area of 0.3 cm2. The rod is free to pivot about an axis through its center, which is also the center of the coil. Initially, the rod makes an angle of ? = 25

An electromagnetic doorbell has been constructed by wrapping 66 turns of wire around a long, thin rod, as shown in the figure. The rod has a mass of 34 g, a length of 8 cm, and a cross-sectional area of 0.3 cm2. The rod is free to pivot about an axis through its center, which is also the center of the coil. Initially, the rod makes an angle of ? = 25 degree with the horizontal. When ? = 0An electromagnetic doorbell has been constructed by wrapping 66 turns of wire around a long, thin rod, as shown in the figure. The rod has a mass of 34 g, a length of 8 cm, and a cross-sectional area of 0.3 cm2. The rod is free to pivot about an axis through its center, which is also the center of the coil. Initially, the rod makes an angle of ? = 25 degree with the horizontal. When ? = 0 degree, the rod strikes a bell. There is a uniform magnetic field of 963 G directed along ? = 0 degree . , the rod strikes a bell. There is a uniform magnetic field of 963 G directed along ? = 0degree.

Explanation / Answer

T = uBsin25 = N*i*A*B*sin25 = 66*2*0.3*10^-4*963*10^-4*sin25 = 0.000161165 Nm

b) W = T*theta = 0.5*I*W^2

0.000161165 *25*(3.14/180) = 0.5*(1/12)*0.034*0.08^2*W^2

W = 2.784 rad/s

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