Two coils of wire are placed one above the other. A current flows through the bottom coil. An EMF will be generated in the top coil if the current is a. Constant b. Changing c. Clockwise d. Counter-clockwise

Q: A 5.0-A current flows through a 10-turn square coil each side of length 0.12 m. the coil is in a…

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Q: A generator has a 450-turn coil that is 10 cm long and 12cm wide. The coil rotates at 8 rev/s in a…

A: Solution:-

Q: 10. An outer metal ring surrounds an inner metal ring, as shown in the figure. The current in the…

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Q: Explain how you could thaw out a frozen water pipe by wrapping a coil carrying an alternating…

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Q: The power lines that run through your neighborhood carry alternating currents that reverse direction…

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Q: 22. The graph shows the variation with time of the output voltage V for the rotating coil generator.…

A: The output voltage of the rotating coil generator is, E=NPZϕ60 A   here N is the rotational speed of…

Q: What is the direction of the induced current? AA B (outward) vat O A. clockwise O B.…

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Q: Determine the magnitude of the torque acting on the free end of the coil and caused by a 0.90-T…

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Q: 3. Two coils of wire are placed one above the other. A current flow through the bottom coil. An EMF…

A: According to Faraday's law rate of change of electric current can produce electric current or induce…

Q: Determine the magnetic induction at pin A in the figure for the conductor of electric current shown…

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Q: the current flows counter clockwise in a coil of wire. what is the direction of the magnetic field…

A: solution as

Q: What is the rate at which the current though a 0.30-H coil is changing if an emf of 0.12 V isinduced…

A: We know that emf  ϵ=-LdIdt dIdt=ϵL

Q: The generator coil shown is rotated through one-fourth of a revolution (from θ = 0º to θ = 90º ) in…

A: The equation for the average induced emf is

Q: 5. A permanent magnet is dropped, south pole-down, through a conducting loop as shown. As the magnet…

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Q: Determine the magnitude of the torque acting on the free end of the coil and caused by a 0.90-T…

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Q: A magnetic field of 30T is directed perpendicular to face a circular coil with a radius of 30cm.…

A: B=Magnetic field=30 Tr=Radius of coil=30 cmA=Area of coil=πr2θ=Angle=0°

Q: 7 In the arrangement shown in figure there are two coils wound on a non- conducting cylindrical rod.…

A: 7.Switch is ON then OFF

Q: 37. "Moving the magnet toward or away from the coil." "Moving a current carrying coil toward or away…

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Q: 12. A coil has 20 turns each with an area of 1.5 x 103 m2. A magnetic field is perpendicular to the…

A: Magnetic flux you calculated get exactly the right value =0.015Wb We can do that as follows:

Q: A generator has a 46-turn coil with an area of 0.07 m2 that turns at 25.0 rad/s in a 0.48 T magnetic…

A: Given, Number of turns,N=46 Area of coil, A=0.07 m2 Angular speed,ω=25 rad/s Magnetic field,B=0.48 T…

Q: Explain briefly in one(1) sentence why a back emf is “zero” during motor starting.

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Q: A generator has a 400 turns coil that is 10 cm long and 12 cm wide. The coil rotates at 8 rev/s in a…

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Q: 2-Set two coils, 600 (primary) and 200 turns (secondary) onto the iron core. Connect the primary to…

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Q: A magnet and a coil are oriented as shown. The magnet is moved rapidly into the coil, held…

A: The magnet is moved rapidly into the coil, in this case the positive current is induced, due to the…

Q: You’re an electrical engineer designing an alternator (the gener-ator that charges a car’s battery).…

A: Given Diameter =D=10 cm radius = r=5 cm emf induced = 14 rpm =N=1200    ω=2πN60 =…

Q: 3. If the current is increased in a coil, the magnetic field: a) increases b) remains the same c)…

A: Magnetic field due to current-carrying circular loop at the center of the loop is given by:

Q: How do the multiple-loop coils and iron ring in the version of Faraday’s apparatus shown  enhance…

A: Coil produces the magnetic field when the switch is closed, the magnetic field produced in the coil…

Q: 7. When a current of 2.0 A flows in the 91 turn primary of an ideal transformer, this causes 14 A to…

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Q: The 1700-turn coil in a dc motor has an area per turn of 1.2 × 10-2 m2. The design for the motor…

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Q: A machine uses a step-up transformer where a 110V input is converted to 220V output Calculate the…

A: Given data: Primary voltage, Vp=110 V Secondary voltage, Vs=220 V Number of turns in primary coil,…

Q: 4 value A step-down transformer (turns ratio = 1:7) is used with an electric train to reduce the…

A: Given: Current in secondary coil, I2= 1.06A        Current in primary coil, I1 = ?      N2N1= 17…

Q: 5- The bar magnet shown in the figure is moved completely through the loop. Find the direction of…

A: Given: A bar magnet and it is inserted to a loop connected to circuit with resistor.

Q: A generator has a 100-turns coil that rotates in a 0.30-T magnetic field at a frequency of 80 Hz,…

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Q: A 140 V emf is across a transformer's 190-turn primary coil.  How many turns should the secondary…

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Q: induced=-NAD, At В What will increase the Voltage produced by a moving magnet? OIncreasing the area…

A: The induced voltage is given by the expression : Vinduced = - N ×∆ϕB∆t where ϕB = magnetic flux =…

Q: 60. What are the directions of the currents in the loop and coils shown in Figure 22.61? Bin B B (a)…

A: From figure (a), the magnetic field is pointing in the inward direction, hence from the right-hand…

Q: 3. A copper ring and a wooden ring of the same dimensions are placed in magnetic fields so that…

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Q: 17. A rod of length L rotates counterclockwise with constant angular velocity w about one end in a…

A: By changing the magnetic flux enclosed by the area swept by the rod in uniform magnetic field, an…

Q: What are the directions of the currents in the loop and coils shown?

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Q: The 1300-turn coil in a dc motor has an area per turn of 2.4 × 10-2 m2. The design for the motor…

A: τmax=NIAB       I=τmaxNAB

Q: 14. A wire is oriented into a loop that has a diameter of 1 cm. This loop is then pulled closed in…

A: Induced EMF is  E = 3.925*10-5 V

Q: Two concentric solenoids carry currents in opposite directions. The inner solenoid has 50 turns per…

A: given,n1= 50 turnsn2= 20 turnsI1=0.80 A

Q: An aluminum disk is held between the poles of a powerful magnet and then pulled out. The person…

A: When there is change in magnetic flux linked with a closed surface ,then emf is induced .If circuit…

Q: A circular coil of wire carries 50 mA of current. The coil has 50 turns and an area of 2.0 cm2. A…

A: when a current-carrying loop is placed in a uniform magnetic field, it experiences a torque. This…