Homework Statement
At time t=0 a 45V potential difference is applied to the leads of a coil with inductance L=50 mH and resistance R=180 ohm. At what rate is the current through the coil increasing at t=1.2ms?
Homework Equations
1) L=EMF/ (di/dt)
2) L=N(flux)/i
3)emf=iR
The Attempt...
Homework Statement
"A square loop of wire is held in a uniform magnetic field of .24 T directed perpendicular to the plane of the loop. The length of each side of the square is decreasing at a constant ratee of 5.0 cm/s. What is the emf induced in the loop when the length 12 cm...
Hi,
thanks for the tip. I set Fcent=Felec= mv^2/r=kQq/r...solving for v^2 I got V[SIZE="1"]1^2= kQq/mr[SIZE="1"]1 and V[SIZE="1"]2^2=kQq/mr[SIZE="1"]2. I pluged these values into the equation KE1+U1=KE2+U2= Wext and got wext= 3KQq/2 (r2-r1/r1r2). Where am I going wrong?
Homework Statement
"A particle of positive charge Q is fixed at point p. A second particle of mass m and negative charge -q moves at a constant speed in a circle of radius r1 centered at P. Derive an expression for the work that must be done by an external agent on the second particle to...
hi,
i'm completely stuck on this problem
Homework Statement
the problem asks for an expression for the work required to create a square charge configuration starting with the charges starting at infinity:
each side is length a. on the top left corner the charge is +q, top right: -q...