11. -16 points SerPSE8 31.P036 My Notes Ask Your Teacher A rectangular coil with

Question

11. -16 points SerPSE8 31.P036 My Notes Ask Your Teacher A rectangular coil with resistance R has N turns, each of length and width in as shown in the figure. The coil moves into a uniform magnetic fiekd B with constant velocity v. What are the magnitude and direction of the total magnetic force on the ccil for the following situations? (Use the following as necessary: N, B, w, v, and R.) (a) as it enters the magnetic field (b) as it moves within the field (c) as it leaves the field Need Help? Read it 12. -12 points PE9 31.P 042 My Notes Ask Your Teacher A 120 urn square coil of s de 20.0 cr rotates about a verticnl axs a ? 1.45 103 rev min ?5 ndicated in the figure below. The honzontal component of Earth's magnetic field st the coil's acat Onis equal to 2.00 10 > T 20.0 cm 20.0 cm (a) Calculate the maximum emf induced in the coil by this field. (b) What is the orientation of the coil with respect to the magnetic field when the maximum emf occurs? ? The plane of the coil is perpendicular to the magnetic field. The plane of the coil is oriented 45° with respect to the magnetic field. The plane of the coil is parallel to the magnetic field. Need Help?ReadIt

Explanation / Answer

11. (A) induced emf = rate of change of flux

= N B dA/dt

= N B w v

and I = N B w v / R counterclockwiese

force will be on rightmost side only.

F = N (IL x B) = N (B w v / R) ( w) (B)

F = N^2 B^2 w^2 v /R .....Ans

  
to the left.

(B) flux does not change, e= 0 => I = 0 => F = 0

Ans : zero

(C) e = B w v

so F = N^2 B^2 w^2 v / R ....Ans

current is clockwise and force will be on left side only.

direction = to the left

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