The electric field of the material between two coaxial cables of radius .25 m and .51 m is given as E = 2.58 V.m/r3. If the conductivity of the material is 5 x 1010 S/m, what is the current density in the material?

Q: a grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rad/s. The angular s...

A: The equations of angular motion we use to solve this are ωf = ωi+αt ωf2-ωi2 = 2αθ, where ωf = the fi...

Q: In a uniform field, if an electron moves in the same direction as the electric field the potential e...

A: An electric field flows from positive charge towards the negative charge. An electron naturally move...

Q: A student under wäter rocks together and makes a sound with a frequency of 639.0 Hz and a wavelength...

A: Given: frequency  f=639.0 Hzwavelength λ =2.4 m

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Q: A block of m 20.0 kg is placed on a plane incline at angle a-37.1 and is connected to a second hangi...

A: Given: m1=20.0 kgα=37.1°μ=0.30s=12.0 mt=3.00s

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Q: Two swimmers relax close together on air mattresses in a pool. One swimmer’s mass is 48 kg, and the ...

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Q: me fundamental frequency t2. If the String has a ass 0.000754 Ko of a guitar String is 247 and what ...

A: fundamental frequency = 247 hz mass = 0.000754 kg length = 0.58 m   

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Q: he spectrum of a star is collected and we find the absorption line of Hydrogen-Alpha (the deepest ab...

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Q: 1. If the pulleys. veightless and frictionless, find the acceleration of body 100 kg A 150 kg B

A: When A moves by distance of x, then B moves by x/2 . Hence, the acceleration of B is half of A. Also...

Q: Problem 2: A 5.0 kg block starts at the bottom of a 30-degree incline ramp with an initial velocity ...

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Q: 3. Erin has 95 minutes to complete a test at school. The test starts at 1:59 PM and Susan has volley...

A: The exam starts at 1:59 PM  Erin has 95 mins to complete the test  so Erin has completed the test at...

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Q: O Part 2: Position Data The table below shows position data for 8 different objects. Let east be the...

A: Given:

Q: Problem #7: An LC circuit is made by attaching a 150-turn solenoid of length 0.75 m and diameter 10 ...

A: Note : As per our answering policies, we can answer upto maximum of 3 sub parts of a question.

Q: Part A A resistor with resistance R and a capacitor with capacitance C are connected in series to an...

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Q: A merry-go-round (model it as a flat disk) is rotating with initial angular velocity 0.50 rad/s and ...

A: Given data: Initial angular velocity (ωi) = 0.50 rad/s Angular acceleration (α) = 0.20 rad/s2 Time (...

Q: A wire carrying 3.50 A of current passes through a 0.0425 T magnetic field that is 0.255 m long. The...

A: Given,   current in wire(I)=3.50A  length of the wire(L)= 0.255 m  magnetic field around it (B)= 0.0...

Q: of 13v ted peo minute.?

A: Given data :           Time  =  t           Resistance  =  R              Voltage  =  V         To f...

Q: The following are statements that describe Electric Potential EXCEPT: A potential energy per unit ch...

A: 3) electric potential = V =Uq 4) potential  energy = U =K q1q2r

Q: The pulleys are frictionless and of negligible weight, find the Tension (N) in the cord supporting b...

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Q: W. prav Wa AK 10. The left end of a spring is attached to a wall. When Bob pulls on the right end wi...

A: Spring force F =-kx  k is spring constant,x is displacement from mean postion. Initially spring is s...

Q: Why is the Galilean telescope more useful viewing objects on the earth, than the Keplerian telescope...

A: A keplerian telescope   has a intersect lens eyepiece and a Galilean Telescope has a departing lens ...

Q: of this frequency in air at a temperature of 20.0°? x 10

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Q: R mb Side View An axle passes through a pulley. Each end of the axle has a string that is tied to a ...

A: Since, there is no friction. Therefore, acceleration of pulley a            =   angular acceleration...

Q: A 2 kg toy car can drive at a constant speed of 20 km/hr, please: a. Calculate the kinetic energy at...

A: Given value--- Mass = 2 kg . speed = 20 km/h. We have to find--- kinetic energy? if voltage = 12 ...

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A: Given: m=0.800kgr=5.0 mNb=25 N speed constant : uniform circular motion  

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A: Given data: Object distance u = 10.3 cm Image distance v = 1.3 cm

Q: 6.10. PROBLEMS 279 missing 5.78 × 1040 electrons). At a distance of 1.18 m from the center of the di...

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Q: + %3D %3D %3D 6.38 In Figure P.6.9, R1 = 100.0 2, R2 = 30.0 N, R3 = 10.0 N, and VB = 20.0 %3B R, B. ...

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Q: 2. A square coil of resistance 4 N, 50 turns and side length 5 cm is placed with its plane making an...

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Q: A 187‑turn circular coil of radius 3.77 cm and negligible resistance is immersed in a uniform magnet...

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Q: A cannonball is fired straight up into the air. The cannonball leaves the cannon at a speed of 31 m/...

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Q: Write down the electrostatic force equation and define each letter and symbol in it. Then compute th...

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Q: A stone is thrown up in the air and just barely makes into onto the roof of a garage. When is its ki...

A: Kinetic energy of any object is given by :- KE =  (1/2)mv2 Kinetic energy of stone will be maximum  ...

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Q: A water wave has a frequency of 5.0 Hz and a wavelength of 4.0 m. (a) What is the period of these wa...

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Q: 8. Find R = Ã+B, given that A has a magnitude of 4 at an angle of 30° above positive x-axis and B ha...

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Q: A 557.0 g pot of water at room temperature (20.0°C) is place on a stove. How much heat is required t...

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Q: Forces exerted on any part of the system by some object outside it a. external force b. impu...

A: Q 1) System is a boundary in which all the parameters in it and on it are measured. The force acting...

Q: A 0.25 kg length of aluminum wire is warmed by 20.6°C by an electric current. How much heat w genera...

A: GivencAl=0.22 kcal/kg°Cm=0.25 kg∆T=20.6°C

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A: We know that the A ski chairlift is suspended between two towers that are 60 m apart.  When the chai...

Q: A ship leaves port at noon and heads due west at 30 knots, or 30 nautical miles per hour. At 3:00 PM...

A: Here we have used trainagle law of vector addition  to calculate bearing or displacement

Q: 202 A block of mass m = 6.23 kg is attached to a spring that is F (N) 6. resting on a horizontal, fr...

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.