Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 287

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IMPORTANT

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The reactance of a coil when used in the domestic $A . C .$ power supply ( $220 V$ , $50$ $cycles per second$ ) is $50 ohm$ . The inductance of the coil is nearly,

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Important Questions on Electromagnetic Induction

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 288

The phase difference between

V

and

I

in pure inductance is,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 289

In an AC circuit,

A C

voltage is,

V = 200 \sin (300 t)

and if,

R = 10 Ω

and

L = 800 mH

, peak value of current will be,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 290

In an

L - C - R

series circuit

R = \sqrt{5} Ω, X_{L} = 9 Ω

and

X_{C} = 7 Ω

. If applied voltage in the circuit is

50 volt

then impedance of the circuit in

ohm

will be

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 291

The resistance

(R)

in a series

L C R -

circuit is

24 Ω

, while the reactance of the inductor

(L)

and the capacitor

(C)

are

2 Ω

and

28 Ω

respectively at a certain frequency. The total impedance

(Z)

of the circuit, if the frequency is halved, is nearly:

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 292

A resistance of $400 Ω$ is connected in series with an inductor of $(\frac{3}{π})$ $H$ and this combination is connected across an $A . C .$ source as shown in figure.

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 293

A choke coil is needed to operate an arc lamp at

250 V (rms)

and

50 Hz

. The lamp has an effective resistance of

15 Ω

when running at

10 A (rms)

. The inductance of the choke coil is:

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 294

A pure inductor of

50.0 mH

is connected to source of

220 V

. Find the inductive reactance. (Assume frequency to be

50 Hz

)

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 295

In an

A C

circuit the potential differences across an inductance and resistance joined in series are respectively

16 V

and

20 V

. The total potential difference across the circuit is-