(a) If the emf of a coil rotating in a magnetic field is zero at t=0 , and increases to its first peak at t=0.100 ms , what is the angular velocity of the coil? (b) At what time will its next maximum occur? (c) What is the period ofthe output? (d) When is the output first one-fourth of its maximum? (e) When is it next one-fourth of its maximum?

Q: A conductor moves with a velocity of 15 m/s at an angle of (a) 90◦, (b) 60◦ and (c) 30◦ to a…

A: Given: velocity of conductor = 15 m/s Length = 2 cm Magnetic flux = 5 µWb

Q: The torque that a uniform magnetic field exerts on a flat (planar) coil is given by T = NBIAsin 0,…

A: 1. Area(A) 2. The magnitude of the torque. given, magnetic fieldB=1.92×10-4 TCurrentI=6.17 Asemi…

Q: Suppose that a rectangular toroid has 1500 windings and a self-inductance of 0.04 H. If the height…

A: Given : Number of turns, N= 1500 Self Inductance, L =0.04 H Height , h = 0.08 m  Energy stored , U=…

Q: An MRI technician moves his hand from a region of very low magnetic field strength into an MRI…

A:

Q: A square conducting loop is in a region of uniform, constant magnetic field. Can the loop be rotated…

A: Can the loop be rotated about an axis along one side and no emf be induced in the loop?

Q: A circular coil with a diameter of 22.0 cmand 155 turns rotates about a vertical axis with an…

A:

Q: A circular loop of wire with radius r= 10 cm and resistance R= 2.0 Ωlies in the xyplane. The loop is…

A: a. Using Faraday's law, emf induced is,…

Q: The magnetic potential P at a point on the axis of a circular coil is given by:- see the equation as…

A: Given, P =2πNIrk∫c∞1r2+x332dx where, N, I,r,k, and c are constants.

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: Suppose that a rectangular toroid has 2000 windings and a self-inductance of 0.040 H. If h = 0.10 m…

A: Using the energy stored in an inductor, U=12LI2I=2UL

Q: If an alternator coil is 13 cm in diameter and is spinning at 1150 revolutions per minute in a 0.13…

A: Using Faraday’s law, the emf induced is,

Q: In a coil with radius of 6 cm and 400 turns, there is a magnetic field leaving in a direction…

A:

Q: A 100-turn square coil of side 20.0 cm rotates about a vertical axis at 4.8 x103 rad/min as…

A: Number of turns = N = 100 Side of the square coil = 20 cm = 0.2 m Area of the coil = A = 0.04 m2…

Q: What direction of the magnetic field causes a counterclockwise direction of induced emf on the…

A: According to Lenz law, The direction of the induced emf that drives current around a wire loop is…

Q: A 0.65-T magnetic field is perpendicular to a circular loop of wirewith 73 turns and a radius of 18…

A:

Q: A solid conducting fly-wheel 1.6 m in diameter, is revolving on a horizontal axle which lies in the…

A:

Q: A magnetic field of magnitude 0.300 T is oriented perpendicularto the plane of a circular loop. (a)…

A: In the vibrations of the guitar string, longitudinal waves will form. Sound is a wave. Waves can…

Q: A maximum e.m.f of 110 volt is induced in a generator whose coil rotate with a Frequency of 50HZ .If…

A:

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

A:

Q: A circular coiVhas a radius of 10 cm and 50 turns are rotated about its vertical diameter in a…

A: i) at position 40° Emf = NBAW Cos40°  228.4 = 50×0.6×(π×0.12)×W×Cos40°  228.4 = 0.722W  W = 316.34…

Q: An emf is induced by rotating a 1000-turn, 20.0 cm diameter coil in the Earth’s 5.00×10−5 T magnetic…

A:

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 circutar.coll (900 turns, radius - 0.145 m) is rotating in a uniform magnetic field. At fieid. At…

A:

Q: A wire of resistance 0.50 ohms forms a loop of area 7.85*10^5 m^2, andthen is placed in a uniform…

A:

Q: An emf is induced by rotating a 1000 turn, 19 cm diameter coil in the Earth’s 5.00 × 10-5 T magnetic…

A: Number of turns , N = 1000 Diameter , d = 19 cm = 0.19 m Radius , R = 0.095 m Magnetic field , B = 5…

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: Determine the induced emf in the alternator as a function of time. (Assume is in V.) = (b)…

A:

Q: nagnet in the previous question is now plunged into a coil that has tu v, the induced current in the…

A: Thus emf induced is proportional to rate of change of magnetic flux.

Q: A 500-turn coil of area 0.00200 m^2 is rotated in a 2.00 T magnetic field. At what frequency, f,…

A: When coil rotated in a magnetic field, Flux linked with the coil at time 't' ; a) ϕ=NBA cosωt…

Q: A circular coil with a diameter of 100 mm, which is at the same plane as one of the sheets, conducts…

A:

Q: The figure shows three situations in which identical circular conducting loops are in uniform…

A: Given data: A figure showing three situations in which uniform magnetic fields that are either…

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: The armature of a small generator consists of a flat, square coil with 120turns and sides with…

A:

Q: the coil's sides are 14.6 cm long, the external magnetic field strength is Bext = 0.783 T, the coil…

A: Sides, a = 14.6 cm = 14.6×10-2 = 0.146 m Magnetic field, Bext = B = 0.783 T Number of turns, n = 37…

Q: A 40 turn conductive loop encloses an area of 0.55 m?. At what constant rate should the magnetic…

A:

Q: efer to diagram 5. 783 turn square coil has resistance 9.8 Q and lies in the plane of the page. A…

A:

Q: What is the induced emf in the below coil if it is moving upward at 4.2 m/s in a uniform magnetic…

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: Suppose that a 0.25 m radius, 500 turn coil produces an average emf of 11300 V when rotated…

A: Here, εavg=NAB∆t=11300V The distance covered in one-fourth revolution will be, ∆θ=14×2π=π2

Q: In a homopolar motor (like Faraday’s motor), what happens to the motion if the current is reversed?

A: A Homopolar motor  is a direct current electric motor with two magnetic poles .The name Homopolar…

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

Q: A coil is placed in a magnetic field and has a flux ΦB through it. The coil is stressed so that its…

A: As flux remains same therefore, B1A1 = B2A2 B2 = B1A1/A2

Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.