If the current increases in a solenoid, the induced emf acts to
A)
decrease the flux.
B)
increase the flux.
C)
first increase then decrease the flux.
D)
first decrease then increase the flux.
E)
have no effect on the flux.
A
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Water pressurized to 3.5 × 105 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?
A. 2.5 × 105 Pa, 15 m/s B. 3.0 × 105 Pa, 10 m/s C. 3.0 × 105 Pa, 15 m/s D. 4.5 × 105 Pa, 1.5 m/s E. 5.5 × 105 Pa, 1.5 m/s
A thermodynamic engine has an efficiency of 31.4% and receives 8.72 kJ of energy per cycle. (a) How much work does it perform in each cycle? (b) How much energy does it exhaust in each cycle?
What will be an ideal response?
A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
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Collisions in which total energy is conserved are said to be elastic collisions
Indicate whether the statement is true or false