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Impedance

47.A self ind...

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47.A self inductance coil has a resistance of 31.4ohm and a self inductance of 17mH the frequency of AC at which the impedance is double of the resistance is 1)5000Hz. 2)500Hz 3)50Hz. 4)250Hz

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Q. An inductance coil has a reactance of

100 Ω

. When an AC signal of frequency

1000 Hz

is applied to the coil. the applied voltage leads the current by

45^{\circ}

. The self-inductance of the coil is

P

Q

are connected in series with an

10 V A C

source of variable frequency. Box

P

contains a capacitance of

1 μ F

in series with a resistance of

32 Ω

Q

has a self inductance

4.9 mH

and a resistance of

68 Ω

. The frequency is adjusted so that the maximum current flows in

P

Q

. Find the impedance of

P

Q

at this frequency.

Q. A box P and a coil Q are connected in series with an ac source of variable frequency. The emf of the source is constant at

10 V

. Box P contains a capacitance of

1 μ F

in series with a resistance of

32 Ω

. Coil Q has a self inductance of 4.9 mH and a resistance of

68 Ω

in series. The frequency is adjusted so that maximum current flows in P and Q.

The impedance of P at this frequency is

Q. A coil has resistance

30 o h m

and inductive reactance

20 o h m

50 H z

frequency. If an

a c

200 v o l t, 100 H z

, is connected across the coil, the current in the coil will be

Q. A current of

1.1 A

flows through a coil when connected to a

110 - V

dc source. When

110 - 50 H z

ac is supplied to the same coil, only

0.5 A

current flows. Calculate the resistance, impedance and inductance of the coil

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