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

Inductors
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

870 mA

87 A

337 mA

87 mA

870 mA

87 A

337 mA

87 mA

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Inductors
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

100 mA

1 mA

10 mA

1 A

100 mA

1 mA

10 mA

1 A

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Inductors
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?

48 s

0.48 ms

0.48 s

0.48 μs

48 s

0.48 ms

0.48 s

0.48 μs

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Inductors
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

9.9 mH or greater than 5 mH

greater than 5 mH

less than 0.6 mH

9.9 mH

9.9 mH or greater than 5 mH

greater than 5 mH

less than 0.6 mH

9.9 mH

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Inductors
The inductance of an iron-core coil decreases if

the iron core is removed

the number of turns is decreased

the length of the coil decreases

None of these

the iron core is removed

the number of turns is decreased

the length of the coil decreases

None of these

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Inductors
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?

78 mA

57 mA

400 mA

91 mA

78 mA

57 mA

400 mA

91 mA

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Inductors

Inductors 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

Inductors An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

Inductors 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?

Inductors A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

Inductors The inductance of an iron-core coil decreases if

Inductors 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?

Inductors
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

Inductors
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

Inductors
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?

Inductors
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

Inductors
The inductance of an iron-core coil decreases if

Inductors
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?