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problem29_55

problem29_55 - 29.55 a)  vBL and F − FB = F − ILB =...

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Unformatted text preview: 29.55: a)  vBL , and F − FB = F − ILB = ma R 2 2 F − ILB F vB L ⇒a= . = − m m mR 2 2 dv F vB 2 L2 ⇒ = − ⇒ v(t ) = vt 1 − e −t (B L mR ) , where vt is the terminal velocity dt m mR calculated in part (b). ε = vBL = IR ⇒ I = ( ) b) The terminal speed vt occurs when the pulling force is equaled by the magnetic v L2 B 2 FR v LB FB = ILB = t = F ⇒ vt = 2 2 . LB = t force: R LB R ...
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