Q5 Q7 Q9

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Nov 24, 2024

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® Acircular wire coil of N turns and radius 7 is placed in a uniform magnetic field B directed out of the page. At ¢ =0, the plane of the coil is perpendicular to the magnetic field. The coil is rotated at a constant angular speed w about a horizontal axis (dashed line). . (a) Ial: %= %( BA (56) S © g = 2R i (njDetermine the emf induced in the coil as a function of time. 4 e(t) = = B.AT - BA Gso (b puppose N =90, r =4cm, B =0.3T, and w =160 rad/s. 14_' What maximum emf is induced in the coil? = N B.Tr ‘_1. v ¢ ¢)What average emf is induced in the coil in the first quarter-tum?(%> v
® Question 7 ©0/1pt O10 Givem 1%7—% —— looXg” T/m _\I._ J_(J'E-_) fndt 83D _ e =fi.@;4&> ket R= J’-% If 20 cm of copper wire (diameter = 10 mm) is formed into a circular loop and placed perpendicular to a uniform magnetic field that is decreasing at the constant rate of 100 mT/s, at what rate is thermal energy generated in the loop? The resistivity of copper is 1.69 x 10~° Q-m. w
A 0.7 kg metal bar lies across two parallel conducting rails separated by a distance of 17 cm. The rails are connected to an emf & = 20 V. The only significant resistance is the 0.08 Q resistance of the bar. The bar is initially at rest and slides with friction (1 = 0.4). The entire apparatus is in a uniform 0.8 T magnetic field directed out of the page. n} E,= B Q_U— _ ' .(. _ s B8 LA~ — 0-8(o.\ (20D = -; r= = 0-08 || Rl ohe TE W w=ma @'—F‘s: o - _}ng—IflB 2 AR cx/ What current flows though the bar when it reaches a speed of 20 m/s? A -(E =wma My - (£) 08 L/ What is the acceleration of the bar when it reaches a speed of 20 m/s? m/s g — ‘E’L.é'i o = A C/ What is the terminal speed of the bar? M I e 502 g TS m/s m f @ Question 10 (¢) =0 = ©0/1pt 910 A= g: 51_
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