EXAMIANS
The inductance of an iron-core coil decreases if
YOUR ANSWER : ?
YOUR ANSWER : ?
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is
YOUR ANSWER : ?
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
YOUR ANSWER : ?
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
YOUR ANSWER : ?
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
YOUR ANSWER : ?
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
YOUR ANSWER : ?
An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is
YOUR ANSWER : ?
An inductance of 0.08 μH is larger than
YOUR ANSWER : ?
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
YOUR ANSWER : ?
A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?
YOUR ANSWER : ?