The bolt of lightning depicted in the figure passes 200 m from a 90 turn coil oriented as shown. If the current in the lightning bolt falls from 7.00x106 A to zero in 9.9 μs, (b) what is the average voltage induced in the coil?

Q: How many coils must a loop have with a cross-sectional area of 0.50m? that is pulled through a…

A: E =4V, A = 0.5m2 B = 0.25T, ∆t  = 1sec  The induced emf in the coil is  E = N.BA/∆t N = ∆t.E /BA N =…

Q: Emk e = 300V, resistor R = 10N, switch S and a toroid of N = 10* number of turns are connected in…

A:

Q: 18) A bar magnet is pushed through a coil of wire of cross-sectional area 0.020 m² as shown in the…

A: Given : Area (A) = 0.020 m2 Number of turns (N) = 7 Rate of change of strength of magnetic field :…

Q: The current in a long solenoid of radius 7 cm and 17 turns/cm is varied with time at a rate of 6…

A:

Q: In an experiment using tangent galvanometer, the magnetic induction is measured at various points on…

A: Galvanometer is a measuring device used to measure the presence of current. When galvanometer is…

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: 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: A rectangular coil with dimensions 0.18 m by 0.27 m has 550 turns of wire. It is rotated about its…

A: Rectangular coil area "A"= 0.18×0.27 m² No. Of turns "N"= 550  magnetic field "B"= 0.56 T  maximum…

Q: 8.1.4. An electric generator in Fig. 8.2 was designed to produce a S Figure 8.2. Problem 8.1.4 peak…

A: Given:Magnetic field = 0.4 TPeak value of emf = 157 VNumber of turns = 25Angular velocity = 3000 rpm

Q: In a stationary field coil of 500 turns calculate the induced voltage produced by the following flux…

A:

Q: The figure shows a copper rod moving at a velocity of 4.5 m/s parallel to a long straight wire…

A: Induced emf is defined as the rate of change of magnetic flux. Magnetic flux is defined as the dot…

Q: Below is a Motional EMF problem with a sliding, conducting bar connecting a wire loop within a…

A: Given:- The velocity of the bar V = 25.0 m/s  The magnetic field B = 0.640 T  The resistance in the…

Q: How fast (in rad/s) must a 92-turn coil spin in a 0.039 T field to create a peak voltage of 8.3 V?…

A: Given number of turns = N = 92 strength of magnetic field = B = 0.039 T peak voltage = Vmax = 8.3 V…

Q: A 20.9 turn conductive loop encloses an area of 0.57 m2. At what constant rate should the magnetic…

A: Given:-             A 20.9 turn conductive loop encloses an area = 0.57 m2.…

Q: In the figure, a 110-turn coil of radius 2.10 cm and resistance 6.80 N is coaxial with a solenoid of…

A: Number of turns , N = 110 Radius , r = 2.1 cm = 0.021 m Resistance , R = 6.8 Ω Number of turns per…

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

A:

Q: .A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the…

A: Given Data: Applied voltage, V=110 V Back-emf, ε=98 V Resistance, R=10 Ω ⇒Motor runs at full speed.

Q: A 100-tum square coil of side 20.0 cm rotates about a vertical axis at 1.8 x10 rev/min as indicated…

A: Given, Number of turns N = 100 Side of coil L = 20 cm = 0.2 m Angular speed = 1.8 x 103 rev/ min =…

Q: In the figure, a 140-turn coil of radius 0.019 m and resistance 6.5 2 is coaxial with a solenoid of…

A:

Q: A magnetic field increases from 0 to 0.30 T in 1.7 s . How many turns of wire are needed in a…

A:

Q: The current flows in the horizontal straight wire is i= ct + dt. For the numerical values given…

A:

Q: In the figure, R- 14.0 Q, C- 6.87 uF, and L-51.0 mH, and the ideal battery has emf 31.0 V. The…

A: R=14.0 Ω C=6.87 μF L=51.0 mH emf=31.0 V

Q: The square loop in Figure P20.62 is made of wires with a total series resistance of 10.0 Ω. It is…

A: the calculate the average current generated is,

Q: An alternating voltage given as; V=100 √2 sin100t is applied to a capacitor of 1 μF. Calculate the…

A:

Q: A coil of wire 8 cm in diameter has 50 turns and is placed in a B field of 1.8 T. If the B field is…

A: ε=N∆ϕ∆t=NA∆B∆t=Nπd2B1-B24∆t=Nπd2B1-B24∆t=503.148 cm1 m100 cm21.8 T-0.6 T40.002 s=151 V

Q: A wire is carrying a current I as shown in the figure. A conducting loop is perpendicular direction…

A: in first question we determine the ans by using lenz law . it is physics question.  ( i will answer…

Q: The figure below shows a flexible loop of metal wire with a radius of 10.0 cm. It lies in a magnetic…

A:

Q: A 5 kW coil has a length of 45 cm. If a length 5 cm is cut from the coil, what power (in kW) is…

A: Given data:  Original Length of coil (L0) = 45 cm Power (P) = 5 kW Length cut from the coil (x) = 5…

Q: If magnetic coils are powered by AC, why don’t their contacts open and close 120 times per second?

A: The overload relay (OLR) is similar in design which is used in manual motor starters. The basic…

Q: The figure shows a rod of length L 8.84 cm that is forced to move at constant speed v 4.19 m/s along…

A: Given : Length of the rod. L = 8.84 cm = 0.0884 m Speed of the rod, v = 4.19 m/s Resistance of the…

Q: You are designing a generator to have a maximum emf of 8.0 V. If the generator coil has 200 turns…

A: Given, Number of turns,N=200 Cross-sectional area,A=0.03 m2 Magnetic field,B=0.03 T Maximum…

Q: A flat circular coil of 1 cm radius is rotated at 10 revolutions per second about an axis that is…

A: Given data The radius of the flat circular coil is: r = 1 cm = 0.01 m The number of revolution by…

Q: he magnetic flux though a coil of wire that has 70 turns is changing at a rate of 0.030 Tm^2/s. What…

A: According to lenz's law magnitude of induced emf = Ndϕmdt , where N is number of loop and dϕmdt is…

Q: A magnet which generates 600 Maxwells of flux, is inserted through a coil of 1000 turns. It is then…

A:

Q: A 100-turn square coil of side 20.0 cm rotates about a vertical axis at 1.6 x10 rev/min as indicated…

A: Data Given ,  No. Of turns ( N ) = 100 Side of the coil ( l ) = 20 cm = 0.2 m So , area of the coil…

Q: The current in a long solenoid of radius 7 cm and 17 turns/cm is varied with time at a rate of 6…

A:

Q: The bolt of lightning depicted in Figure P20.61 passes 200. mfrom a 100-turn coil oriented as shown.…

A:

Q: A 2500 turns square coil has sides of 7.6 cm. A uniform magnetic field passes through the plane…

A:

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.