A flux of 4.0 Times 10-5 T middot m^2 is maintained through a coil of area 7.5 c

Question

A flux of 4.0 Times 10-5 T middot m^2 is maintained through a coil of area 7.5 cm^2 for 0.50 s. What emf is induced in this coil during this time by this flux? 8.0 Times 10-5 V 4.0 Times 10-5 V 3.0 Times 10-5 V 2.0 Times 10-5 V No emf is induced in this coil. A conductor is formed into a flat loop that encloses an area of The plane of the loop is oriented at a 30.0 degree angle with the xy-plane. A uniform time-varying magnetic field is oriented parallel to the z-axis. If the emf induced in the loop is what is the rate at which the magnetic field strength is changing? 29 T/s 22 T/s 50 T/s 13 T/s A number of resistors are connected across points A and B as shown in the figure. What is the equivalent resistance between points A and B? 40 Ohm 6 Ohm 8 Ohm 10 Ohm 12 Ohm Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination? The equivalent resistance is less than that of the smal

Explanation / Answer

24. induced emf = rate of change of flux

change in flux = 0

emf = 0

25. emf = d ( B.A )/dt = = A cos@ dB/dt

dB/dt = emf / (A cos@) = 25 / (1 x cos60) = 50 T/s

26. four 2 ohm resistor and 4 ohm resistor are in series.

theire equivalent, R' = 4x2 + 4 = 12 ohm

now 6ohm and 12 ohm are in paralllel,

1/R" = 1/6 + /12

R" = 4 ohm

this will continue so Req = 2 + 2 + 4 = 8 ohm

27. IN parallel,

equivalent resistance will be less than that of the smallest resistor.

Ans(A)

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