Two coils are made using the same length of wire and the same number of turns per length, but coil A has twice as many turns as coil B. What is the ratio of their inductances LA/LB?

Q: An emf of 0.60 V is induced across a coil when the current through it changes uniformly from 0.30 to…

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Q: An induced EMF of 16 V exists in a coil when the current in the coil changes at a rate of 42 A/s.…

A: Given data: Induced EMF is, e=16 V. Rate of change of current is, dIdt=42 A/s.

Q: The resistance of a coil is 52 0. When the frequency is 80 Hz, the voltage on the coil is 72,3°…

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Q: An emf of 9.7mV is induced in a coil while the current in a nearby coil is decreasing at a rate of…

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Q: A coil is wound as a transformer of rectangular cross-section. If all the linear dimensions of the…

A: Self inductance L= μ0 N2 A / l = μ0 n2 lA

Q: The current (I) takes 5 ms to reach 90% of its max value. The inductance (L) of the coil is equal to…

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Q: A coil has 2.55-ΩΩ resistance and 121-mH inductance. If the current is 3.00 A and is increasing at…

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Q: An AC generator has 80 rectangular loops on its armature. Each loop is 15 cm long and 9 cm wide. The…

A: The expression for the maximum output voltage,

Q: The self-inductance of a coil is zero if there is no current passing through the windings. True or…

A: Self inductance of a coil

Q: precision laboratory resistor is made of a coil of wire. The coil is 1.3 cm in diameter, 4.25 cm…

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Q: At t = 0, an emf of 500 V is applied to a coil that has an inductance of 0.800 H and a resistance of…

A: Values given in the question are as follow; ε=500 VR=30 ΩL=0.8 H Maximum current; Io=εRIo=500…

Q: Calculate the inductance of the coil shown in Figure Q3(b), which has a cylindrical iron core with…

A: Given Data: The relative permeability of iron core is: μr=2000 The number of turns of the coil is:…

Q: A solenoid 40 cm long is wound with 800 turns of wire. The cross-sectional area of the coil is 1.5…

A: Answer                0.302

Q: The current in a coil drops from 4.2 A to 2.8 A in 0.51 s. If the average emf induced in the coil is…

A: Given: The initial current in the coil is 4.2 A. The final current in the coil is 2.8 A. The time…

Q: n inductance of 3 H and a wire resistance of 15 Ω. How long will it take for the current to reach…

A: GivenL=3 HR=15 Ω

Q: A rectangular coil is 5.00 cm long and 2.50 cm wide and has 222 turns of wire. The coil is rotated…

A: No of turns in the coil is n = 222 length l = 5.0 cm width w = 2.50 cm Area of the coil is A = l x w…

Q: Two coils connected as shown in the figure separately have inductances L1 = 34 mH and L2 = 50 mH.…

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Q: What is the self-inductance of a coil whose reactance is 10 Ω at 60 Hz?

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Q: Let say that a flat coil of wire, having 5 turns, has an inductance L. Then the inductance of a…

A: For any coil of wire the inductance is given by the following formula : L = µN2A / l µ refers to the…

Q: An emf of 121.5 mV is induced in the windings of a coil when the current in a nearby coil is…

A: The formula for the induced emf in term of mutual inductance is:

Q: A thin wire is tightly wrapped around a dowel (a wooden cylinder of radius 5.49 cm, length 0.28 m)…

A: Given that: Radius of the cylinder, r= 5.49 cm = 0.0549 mLength, l= 0.28 mNumber of turns in each…

Q: A coil of wire with a resistance of 0.15 Ω has a self-inductance of 0.083 H. If a 5.0-V battery is…

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Q: The current flowing through a circuit is changing at a rate of 6.00 A/s. If the circuit contains a…

A: The rate of change of current,   The inductance,

Q: The inductance of a closely packed coil of 400 turns is 6.5 mH. Calculate the magnetic flux (per…

A: The coil with 400 turns can be considered as a solenoid. The expression for inductance of a solenoid…

Q: How many turns should a solenoid of cross-sectional area0.035 m2 and length 0.32 m have if its…

A: The solenoid’s cross-sectional area is, The solenoid’s length is, The inductance of a solenoid is,

Q: When the current in one coil changes at a rate of 5.6 A/ s, an emf of 6.3 × 10−3 V is induced in a…

A: Mutual indutance is the magnetic flux through coil 2 due to current in coil 1.

Q: Two coils have a mutual inductance of 2.34 x 10 H. The current in the first coil increases at a…

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Q: A series RL circuit includes a 8.05 V8.05 V battery, a resistance of ?=0.655 Ω, and an inductance of…

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Q: An emf of 9.7 × 10−3 V is induced in a coil while the current in a nearby coil is decreasing at a…

A: ε1=-MdI2dtM=-ε1dI2dt

Q: If the current in an inductor is doubled, by what factor is the stored energy multiplied?

A: If the current in an inductor is doubled, by what factor is the stored energy multiplied?

Q: An emf of 96.0 mV is induced in the windings of a coil when the current in a nearby coil is…

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Q: What is the frequency of oscillation of a DC LRC circuit with L = 5.00 H, R = 10.0 Q, and C = 0.0200…

A: The frequency of oscillation of the DC LRC circuit is f =12πLC Where L =inductance, C =inductance

Q: The current of a coil of inductance L = 0.1 H varies with time according to I = 4 t2 - 6 t, where I…

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Q: Physics The heating coils in a hair dryer are 0.800 cm in diameter, have a combined length of 1.00…

A: in this question we get inductance , energy and emf.

Q: How many turns of wire would be required to make a 150 mH inductance out of a 20.0 cm-long…

A: Given data : self inductance of coil, L = 150 mH = 0.150 HLength of coil, l = 20.0 cm = 0.2 m…

Q: The current in a coil decreases from 9.0 A to 5.5 A in 0.30 s. If the average emf induced in the…

A: Solution: given that current in a coil decreases from 9.0 A to 5.5 A in 0.30 s emf  = 25 mV

Q: The inductance of a closely packed coil of 400 turns is 8.0 mH. Calculate the magnetic flux through…

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Q: Two coils have a mutual inductance of 1.93x10-4 H. The current in the first coil increases at a…

A: Induced emf in the second coil is given by, ∈=M dIdt, M is mutual inductance and dIdt is rate of…

Q: Figure Q3(a) Calculate the inductance of the coil shown in Figure Q3(b), which has a cylindrical…

A: Given   Number of turns of the coil N= 200 Length l =200mm = 0.2 meters Diameter d=5mm Then radius…

Q: Two coils are placed side by side. An emf of 0.8 V is observed in one coil when the current is…

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Voltage Across Inductor

An actor is a passive electrical component that consists of a coil bent in the form of wire which uses electromagnetism to produce electric current through the coil. When the electric current flows through a conductor that is the coil, a magnetic flux is developed around the conductor. This flow of current through the coil creates a magnetic field based on Fleming's Right-hand thumb rule. If there is any decrease in the current passing through the inductor, then the magnetic field will also decrease and energy is released through the generation of electric current. There is also a secondary voltage inducing in the same coil due to the magnetic flux, since it opposes any changes in the electric current flowing through the circuit. An inductor is also called choke, coil, or solenoid. A choke is designed to block certain frequencies when the DC current passes. A winding coil is coated with insulation to give extra insulation and protect the circuit. They are usually tightly wrapped around a central core which is cylindrical in nature so that the magnetic flux can be induced. The solenoid is a three-dimension coil that is used to exhibit electromagnetism when the magnetic field is developed due to the current flowing through the coil. The sign convention of the inductor is the same as the power dissipating device. When the current flows into the positive side of the voltage across the inductor, the value is positive and the inductor dissipates power whereas when the inductor releases the power back to the circuit, the current has a negative sign convention.