An inductor consists of 100 turns of wire tightly wound about an insulating core. It is attached to a power supply and when the current through it is increased from 0 to 5 A in 3, s an induced emf of 5 V is measured. Find the inductance of this device and the magnetic flux and the energy stored in the magnetic field when the current is held steady at 5 A.

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: Two coils are placed near each other and they have a mutual inductance of 879.1 mH. If the current…

A: mutual inductance(M)=879.1 mH=879.1×10-3H  current i(t)=0.5e-1,625.3t to find: induced emf at…

Q: A circular coil of radius 12.5 cm is located in a region of magnetic field where  B(t) = (+0.3…

A: It is given that,

Q: When a certain inductor carries a current I, it stores 3mJ of energy in its magnetic field. How much…

A: Suppose inductance of conductor is L. Current flowing throught inductor is I. Energy = LI²/2.

Q: Two solenoids are part of the spark coil of an automobile. When the current in one solenoid falls…

A: The mutual inductance between two solenoids can be related to the self-inductance of the two…

Q: Find the magnetic energy stored by a 4.94 mH inductor when the current through it is 1.3 A.

A: Given data:  Inductance (L) = 4.94 mH = 4.94×10-3 H Current (I) = 1.3 A Required: The magnetic…

Q: Suppose that a rectangular toroid has 2,000 windings and a self-inductance of 0.060 H. If the height…

A: The energy stored in an inductor is, U=12LI2

Q: The wire of a tightly wound solenoid is unwound andused to make another tightly wound solenoid of…

A: The mathematical expression for the inductance is given as  L=μ0N2Al Here, μ0 is the permittivity of…

Q: If the value of inductance is 20 H and 4A of current flows through it, Find the value of energy…

A: Write the given values of this problem. L=20 HI=4 A

Q: A simple AC generator consists of 20 coils of wire with an area of 1000cm2 and placed in a region…

A:

Q: An inductor has a current I(t) = (0.500 A) cos[(275s-1)t] flowing through it. If the maximum emf…

A: An inductor is a passive electrical device which stores energy in a magnetic field when current is…

Q: A long, straight solenoid with a radius of rs = 3.0 cm and a length of y = 25 cm is wound with 1,500…

A:

Q: If the emf of the battery of Figure 14.12 (b) is reduced by a factor of 2, by how much does the…

A: The inductor’s energy can be given as, Here, L and I represent the inductor’s inductance and…

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: How fast can the 150 A current through a 0.250 H inductor be shut off if the induced emf cannot…

A: Given:  Current, i = 150 A  inductance, L = 0.25 H  Voltage, V = 75 V

Q: Find the magnetic energy stored by a 4.94 mH inductor when the current through it is 10.3 A.

A: Given: The inductance of the inductor is 4.94 mH. The electric current is 10.3 A.

Q: A lab tech observes that the current in a coil of conducting wire goes from i, At = 0.200 s.…

A: By general definition the voltage in in an inductor is defined as E = L di/dt  .L = Inductance di =…

Q: "A square loop of wire is placed in a magnetic field that is perpendicular to its plane. The of each…

A:

Q: Find the self-inductance of a solenoidal coils with n turns per unit length and A cross sectional…

A: Magnetic flux =BA Cosθ

Q: In a 280-turn automobile alternator, the magnetic flux in each turn is . = 2.50 x 10* cos wt, where…

A: The emf induced due to N closely spaced coils is given by Lenz's law:ε=-NdϕBdt………(1)where,ϕB is the…

Q: A 24-V battery is connected in series with a resistor and aninductor, with R = 8.0 Ω and L = 4.0 H,…

A: Formula to calculate current at any time in a circuit is,

Q: Calculate the self-inductance (in mH) of a 50.0 cm long, 10.0 cm diameter solenoid having 1000…

A:

Q: In the circuit shown, the switch is con- nected to position a for a long time, then thrown to…

A:

Q: Two coils are placed near each other and they have a mutual inductance of 887.4 mH. If the current…

A:

Q: A coil consists of 25 loops of wire and has a diameter of 10 cm. Its resistance is 0.1Ω. At t=0 it…

A:

Q: A 2.00-H indductor carries a steady current of 0.500A. When the switch in the circuit is opened,the…

A: L = 2.00H Steady Current (Ii) = 0.500 Amp time = 10.0 ms

Q: Consider a coil with 950 loops that is pulled in-between magnetic poles in 0.12 s. The coil…

A:

Q: An ideal solenid of unknown length and cross-section has an inductance of 4.0mH. When current flows…

A: Given data *The given inductance of the inductor is L = 4.0 mH = 4.0 × 10-3 H *The given induced emf…

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

A:

Q: Suppose the base unit of an inductive charger produces a 1.50×10^-3 T magnetic field. Varying this…

A: The given magnetic field has a magnitude B=1.5×10-3 T This magnetic field passes through a circular…

Q: Suppose the base unit of an inductive charger produces a 1.10×10^-3 T magnetic field. Varying this…

A: The electric field may be thought of as an electric property associated with every place in space…

Q: The magnetic flux through the loop increases according to the relation shown below. What is the…

A: Magnitude of Induced EMF is given by: EMF = N*d(phi)/dt phi = Magnetic flux = (6.5t^2 + 1.9t) Wb N =…

Q: Find the magnetic energy stored by a 5.22 mH inductor when the current through it is 11.1 A.

A:

Q: Find the magnetic energy stored by a 5.24 mH inductor when the current through it is 10.7 A.

A: Given GivenL=5.24 mH = 5.24 ×10-3 HI =10.7 A

Q: When the current in a toroidal solenoid is changing at a rate of 0.234 A/s, the magnitude of the…

A: Given: current in the toroidal solenoid is changing at a rate of 0.234 A/s induced emf is 9 mV…

Q: A 96-mH solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. A coil is…

A: Given : Inductance=I=96 mH Length=l=0.80 m Radius=r=0.05 m Resistance of coil=R=9.9 ohm Mutual…

Q: A 96-mH solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. A coil is…

A:

Q: A magnetic field of 0.200 T exists within a solenoid of 340 turns and a diameter of 10.0 cm. Within…

A:

Q: Does the induced emf always act to decrease the magnetic flux through a circuit?

A: According to Lenz's law -  "An induced electric current flows in a direction such that the current…

Q: The self-inductance of a coil of 500 turns is 0.25h. Y 60% of the flux of the last coil of its speed…

A: Given, No.of coil(N)=500 Self-inductance (L)=0.25h Current per second=100amp/sec

Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.