Please help with 7 and 8. Show work and explain. Got quiz tomorrow and trying to

Question

Please help with 7 and 8. Show work and explain. Got quiz tomorrow and trying to get this down.

The moving rod in Fig. 20-4 is 13.2 cm long and generates an cmf of 120 mV while moving in a 0.90-T magnetic field, What is its speedWhat is the electric field in the rod?.A 500-tum solenoid, 25 cm long, has a diameter of 2.5 cm. A 10-tum coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 5.0 A in 0.60 s, what will be the induced emf in the short coil during this time?

Explanation / Answer

7)

a) emf = B*v*L

==> v = emf/(B*L)

= 0.12/(0.9*0.132)

= 1.01 m/s or 101 cm/s

b) E = emf/L

= 0.12/0.132

= 0.909 N/c

8) induced emf = N*A*dB/dt

= N*A*(mue*N/L)*dI/dt

= (mue*N^2*A/L)*dI/dt

= (4*pi*10^-7*500^2*pi*0.0125^2/0.25)*(5-0)/0.6

= 5.135*10^-3 volts or 5.135 mVolts

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