5. A radar pulse returns to the transmitter-receiver after a total travel time o

Question

5. A radar pulse returns to the transmitter-receiver after a total travel time of 4.00x10^-4 s. How far away is the object that reflected the wave? 6. Two coils are close to each other. The first coil carries a current given by i(t) = 5.00 e^-0.025t sin 120 pi t, where i is in amperes and t is in seconds. At t = 0.800 seconds, the emf measured across the second coil is -3.20 V. What is the mutual inductance of the coils? 7. What new concept did Maxwell's generalized form of Ampere's law include? 8. In the circuit shown, let L = 7.00 H, R = 9.00 ohm, and e = 120 V. What is the self-induced emf 0.200 s after the switch is closed?

Explanation / Answer

5.

The distance travelled by the light is d =velocity *time =3*108m/s*4*10-4s =12*104m

This is total distance, therefore the distance from object to reflective wave is half the distance

d =total distance/2 =6*104m=60km

7.

Integral B.ds =uo(I+Id) =uoI+uoeodE/dt

Where Id is the displacement current

"magnetic fields are produced both by conduction currents and by time-varying electric fields”.

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