Recent content by Lance WIlliam

Homework Statement A steel ball bearing is encased in a Pyrex glass cube 1.0 cm on a side. At 390K , the ball bearing fits tightly inside the cube. At what temperature will it have a clearance of 0.90pico meters all around? Homework Equations coefficient of linear expansion...

Homework Statement A conducting loop with area 0.13m^2 and resistance 5.0 ohms lies in the x-y plane. A spatially uniform magnetic field points in the z direction. The fields varies with time according to B_z_=at^2 - b, what a=2.4 T/s^2 and b=8.2 T Find the loop current t=1.5s I=...

EEn is a major in Electronic Engineering

And I can solve for B by using I=E/R Since I have "R and "I" and I know E is B(pi)r^2 and I know what "r" (since I know area)is I can solve for "B" using [B(pi)r^2)=IR Then I'll have "B" So I pull out my constants on the intergral so its A*cos (Delta B/Deltat) But How do I go about finding "t"?

so once the E is pulled outside the intergral I am left with "dr" to intergrate. "dr" being 45V/m? I am confused on the V/m as a measure for the radii. Why would I want the circumferance? I guess what is comes down to is dB/dt...Is is saying Find the derivative of(magnetic flux / some measure...

Ok so...Ur using "V" as emf. Got it. dB/dt...the derivative...of..Where do I get "B" to even solve for mag. flux? I See V=(14)(320mA) so I have V=-d(phiB) which is BAcos(theta) But how do I get "B"? and once found what is my dt?

Homework Statement The induced electric field 17cm from the axis of a solenoid with a 10 cm radius is 45V/m . Find the rate of change of the solenoid's magnetic field? dB/dt= T/s Homework Equations Faradays Law W/ the intergral due to changing...

A conducting loop of area 240cm^2 and resistance 14(Ohm symbol) lies at right angles to a spatially uniform magnetic field. The loop carries an induced current of 320mA . At what rate is the magnetic field changing? dB/dt= T/s Ok... So, I use...

Question about how to study physics; general question all input is allowed:)THANKS Ok so I am a EEN major and while I know there are others with a lot harder course load I am taking...Vector Cal(252). university physics 2(242). arabic 2(112), and busniess course(business magt. is my...

b]1. Homework Statement [/b] What is the magnetic field strength 0.10 from the axis of a 1.0--diameter wire carrying 5.0 distributed uniformly over its cross section? The answer is 4G I got the part right Part B What is the field strength at the surface of the wire? I got this...

Homework Statement Find the radius of the circular path described by a proton moving at 15 in a plane perpendicular to a 400- magnetic field. Homework Equations I used the Eqn: r=mv/qB So (1.67e-27)(15ooom/s)/(1.60e-19)(400) and I go 6.265e-2 m but the answer is in mm so I...

Ok I did it again and got 8.18e15 for my (a) Then I need to find (E) so I changed the formula around so its "a/(q/m)=E" and I got 1.19e-33 ...wrong again...

Homework Statement How strong an electric field is needed to accelerate electrons in a TV tube from rest to one-tenth the speed of light in a distance of 5.5 Homework Equations I used uniform accel. formula v^2=V_o_+2a(delta X) v=3e7 (1/10th speed of light) V_o_=Rest...

Homework Statement \Sigma (1/2^n+1/3^n) n=1 Homework Equations The Attempt at a Solution I get 7/2 by using a/1-r to both than adding...what am I doing wrong 2+3/2= 7/2

Homework Statement Finding the Radius of interval convergence of \sum n=1(there's a infinity on the sigma), "x^n/2^n" I really don't have a clue on which way I should go. Just a hint would be great:) Homework Equations The Attempt at a Solution