You have a circular loop of wire in the plane of the page with an initial radius of 0.50  m  which expands to a radius of 1.00  m . It sits in a constant magnetic field  B  = 38  mT  pointing into the page. Assume the transformation occurs over 1.0 second and no part of the wire exits the field. Also assume an internal resistance of 30  Ω . What average current is produced within the loop and in which direction?

Q: To measure the magnetic field, one of the method is through a coil of N turns of area A and placed…

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Q: A long copper strip 1.8cm wide and 1.0mm thick is placed in a 1.2T magnetic field. When a steady…

A: Given: w =1.8 cm =1.8*10-2 mt = 1.0 mm =1.0 *10-3 mB=1.2 TI=15 A∆V=1.02 μV=1.02*10-6 V

Q: A long vertical wire carries an unknown current. Coaxial with the wire is a long cylindrical…

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Q: 3. Figure 3 shows a uniform magnetic field B confined to a cylindrical volume of radius R. The…

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Q: The drawing shows a type of flow meter that can be used to measure the speed of blood in situations…

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Q: A square wire with 2 m sides is perpendicular to a uniform magnetic field, with half the area of the…

A: Given data, Length L=2 m EMF of battery ε=20 V Magnetic flux B=1.041-0.84t

Q: A solenoid of 36 turns and area 20 cm2 has its ends connected together though a resistance of 5…

A: Using Faraday's law of electromagnetic induction Where e = emf induced, t = time,  = Magnetic flux

Q: Below is a rectangle that is being pulled into a magnetic field as shown. The rectangle has a height…

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Q: A 2.6 kg block is attached to a horizontal rope that exerts a variable force Fx (205x) N, where x is…

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Q: Protons having a kinetic energy of 3.10 MeV are moving in the positive x-direction and enter a…

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Q: A uniform magnetic field is perpendicular to the plane of a circular loop of diameter 15 cm formed…

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Q: A length of copper wire carries a current of 11 A, uniformly distributed through its cross section.…

A: Given,Current I=11Awire diameter d=2.1mmradius r=2.12=1.05mm

Q: A circular metallic disc is placed with its plane perpendicular to a uniform magnetic field of flux…

A: The Ohm's law is given by  V =I R  where, I is the current, R is the resistance and V is the…

Q: The force on a wire is a maximum of 5.16 N when placed between the pole faces of a magnet. The…

A: The maximum force on the wire when it is placed between pole faces of magnet, is The current is…

Q: A solenoid of 69 turns and area 20 cm2 has its ends connected together though a resistance of 5…

A: Given value--- No. of turns = 69. Area = 20 cm2.  Resistance = 5 Ohm. Magnetic field = 3 × 10-2 T.…

Q: One hundred turns of (insulated) copper wire are wrapped around a wooden cylindrical core of…

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Q: I got 0.1981686061 V

A: 0.40 VExplanation:

Q: The slide generator in the figure below is in a uniform magnetic field of magnitude 0.0500 T. The…

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Q: An intrepid physics student transports a loop of wire from their hometown all the way to Earth's…

A: Given: An intrepid physics student transports a loop of wire from their hometown all the way to…

Q: A V = 30 mV battery is connected to a single turn loop of dimensions a = 13 cm by b = 12.5 cm has a…

A: The given values are, V=30 mV=0.030 VA=a×b=13 cm×12.5 cm=13×10-2 m×12.5×10-2 m=162.5×10-4 m2R=15.5…

Q: Below is a rectangle that is being pulled into a magnetic field as shown.  The rectangle has a…

A: GIVEN:- h=0.680 m, v=155m/s ,R=11.50 ohms, B=48mT Introduction:- We know that In motional…

Q: The slide generator in the figure below is in a uniform magnetic field of magnitude 0.0500 T. The…

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Q: AV = 36 mV battery is connected to a single turn loop of dimensions a = 15 cm by b = 8 cm has a…

A: Calculate the area of the loop. A=abA=(15 cm)(8 cm)A=120 cm2×(1 m100 cm)2A=1.20×10−2 m2

Q: solenoid of 35 turns and area 20 cm2 has its ends connected together though a resistance of 5 Ohms.…

A: Given  number of turns N = 35  area A = 20 cm2 = 20 × 10-4 m2  resistance R = 5 ohm  magnetic flux…

Q: A v-shaped metal rod completes a circuit while sliding without friction on a pair of rails in a…

A: The force (in Newtons ) pulling the rail downwards. given, Velocityv=7.28 m·s-1magnetic fieldB=6.40…

Q: A uniform magnetic field points from the S to N and has a magnitude of 0.022 T. A straight copper…

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Q: A circular metallic disc is placed with its plane perpendicular to a uniform magnetic field of flux…

A: The speed of a point on the disc (of radius R)at a distance x, from the center is v=ωx, Then…

Q: In the figure, an electron with an initial kinetic energy of 4.40 keV enters region 1 at time t-0.…

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Q: A rectangular conducting loop has sides a = 0.065 m, sides b = 0.15 m, and resistance R = 55 Ω. It…

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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.