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Chapter 16: Problem 10

A choke coil has (A) high inductance and high resistance. (B) low inductance and low resistance. (C) high inductance and low resistance. (D) low inductance and high resistance.

Short Answer

Expert verified
A choke coil should have high inductance to efficiently block high-frequency AC signals and low resistance to reduce energy loss and allow lower-frequency AC or DC signals to pass through. Therefore, the correct choice for a choke coil is (C) high inductance and low resistance.

Step by step solution

01

Define Inductance and Resistance

Inductance is the property of an electrical conductor by which a change in electric current through it induces an electromotive force in the conductor itself or in any nearby conductors due to the magnetic field created by the current. Resistance, on the other hand, is the measure of the opposition to the flow of an electric current through a conductor.
02

Purpose of a Choke Coil

A choke coil is designed to block certain frequencies, specifically higher-frequency AC signals, while allowing lower-frequency AC or DC signals to pass through. This is achieved by its high inductance, which reacts to changes in the magnetic field created by the alternating current. The higher the inductance, the more the choke coil can filter out high-frequency AC signals.
03

Desired Characteristics of a Choke Coil

Based on its purpose, we can determine that a choke coil should have high inductance to efficiently block high-frequency AC signals. Additionally, a choke coil should have low resistance in order to reduce energy loss in the form of heat and to allow lower-frequency AC or DC signals to pass through with minimal impedance.
04

Conclusion

With these considerations, we can conclude that the correct choice for a choke coil is: (C) high inductance and low resistance.

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Most popular questions from this chapter

A conducting square loop of side \(L\) and resistance \(R\) moves in its plane with a uniform velocity \(v\) perpendicular to one of its sides. A magnetic field \(B\), constant in space and time, pointing perpendicular and into the plane of the loop exists everywhere as shown in Fig. 16.38. The current induced in the loop is (A) \(B L v / R\) clockwise (B) \(B L v / R\) anti-clockwise (C) \(2 B L v / R\) anti-clockwise (D) Zero

The EMF induced in a 1 millihenry inductor in which the current changes from \(5 \mathrm{~A}\) to \(3 \mathrm{~A}\) in \(10^{-3}\) second is (A) \(2 \times 10^{-6} \mathrm{~V}\) (B) \(8 \times 10^{-6} \mathrm{~V}\) (C) \(2 \mathrm{~V}\) (D) \(8 \mathrm{~V}\)

In a uniform magnetic field of induction \(B\), a wire in the form of a semicircle of radius \(r\) rotates about the diameter of the circle with an angular frequency \(\omega\). The axis of rotation is perpendicular to the field. If the total resistance of the circuit is \(R\), the mean power generated per period of rotation is (A) \(\frac{(B \pi r \omega)^{2}}{2 R}\) (B) \(\frac{\left(B \pi r^{2} \omega\right)^{2}}{8 R}\) (C) \(\frac{B \pi r^{2} \omega}{2 R}\) (D) \(\frac{\left(B \pi r \omega^{2}\right)^{2}}{8 R}\)

A coil of inductance \(1 H\) and resistance \(10 \Omega\) is connected to a resistance-less battery of EMF \(50 \mathrm{~V}\) at time \(t=0 .\) The ratio of rate at which magnetic energy is stored in the coil to the rate at which energy is supplied by the battery at \(t=0.1 \mathrm{~s} .\) is \(x \times 10^{-2}\). Find the value of \(x\). (Given \(\left.\frac{1}{e}=0.37\right)\)

Two straight long conductors \(A O B\) and \(C O D\) are perpendicular to each other and carry currents \(I_{1}\) and \(I_{2}\), respectively. The magnitude of the magnetic induction at a point \(P\) at a distance \(a\) from the point \(O\) in a direction perpendicular to the plane \(A B C D\) is (A) \(\frac{\mu_{0}}{2 \pi a}\left(I_{1}+I_{2}\right)\) (B) \(\frac{\mu_{0}}{2 \pi a}\left(I_{1}-I_{2}\right)\) (C) \(\frac{\mu_{0}}{2 \pi a}\left(I_{1}^{2}+I_{2}^{2}\right)^{1 / 2}\) (D) \(\frac{\mu_{0}}{2 \pi a}\left(\frac{I_{1} I_{2}}{I_{1}+I_{2}}\right)\)
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