In: Physics
Select the correct answer
1- The current i through an inductor cannot change abruptly. The rate of change di/dt also cannot change abruptly. Both quantities must always be continuous. (True/ FALSE)
2- When a steady current flows through an inductor, there is no energy flow in or out of the inductor. (True/ FALSE ).
3- Long after an emf has been connected to an RL circuit and the current has stabilized, the voltage across the inductor is (Zero / None Zero)
4- When the current through an inductor increases, energy is (stored within / released from) the inductor. When the current decreases, energy is (stored within/ released from) the inductor.
5-The ballast used for a fluorescence tube keeps the current from growing unacceptably large (True/ False).
6-If you increase the inductance in an RL circuit, it takes __________ for the current to reach its final value. (More time/ Less time).
7-The voltage across an inductor is proportional to what? (The current through it / The derivative in time of the current through it / The integral in time of the current through it).
8-If you increase the resistance in an RL, it takes ______________ for the current to reach its final value. (more time/ less time).
9- Immediately after an emf is connected to an RL circuit, the current through the inductor is ___________.(zero/ nonzero)
10- The final (steady state) current through a circuit containing a source of emf, a resistor, and an inductor does not depend of the value of the inductance. (True / false)
11- If the current doubles in an ideal solenoid, what happens to its magnetic energy density? (It is halved / It is doubled/ It is quadrupled /It is quartered).