Recent content by qlzlahs

Whoops. So I think I use this equation for magnetic fields in cylindrical conductors?: B = (µ_0*I*r) / (2π*a^2), where a is the radius and r is the distance.

Homework Statement A coaxial cable consists of an inner cylindrical conductor of radius R1 = 0.040 m on the axis of an outer hollow cylindrical conductor of inner radius R2 = 0.080 m and outer radius R3 = 0.090 m. The inner conductor carries current I1 = 4.4 A in one direction, and the outer...

So I use V = -A*(dB/dt), then use V = IR to find the current?

Homework Statement A 21cm×21cm square loop has a resistance of 0.12 Ω . A magnetic field perpendicular to the loop is B=4t−2t^2, where B is in tesla and t is in seconds. (A) What is the current in the loop at t=0.0s? (B) What is the current in the loop at t=1.0s? Homework Equations for a...

Do I use the equation V = (k*q)/(sqrt(R^2 + z^2)) for both points A and B? With R = 2.4 and z = 1.8 for A, and z = 3.2 m for B?

So.. How do I know how much potential there is at point B?

I was assuming that if the ring contributes to the potential at point A, it would to point B as well.

Homework Statement A charge Q = -820 nC is uniformly distributed on a ring of 2.4 m radius. A point charge q = +530 nC is fixed at the center of the ring. Points A and B are located on the axis of the ring, as shown in the figure. What is the minimum work that an external force must do to...

Thanks! Got it.

So the potential at A is: (9*10^9*4*10^(-6))/(.3) + (9*10^9*-4*10^(-6))/(.5) = 48,000 V and the potential at B is: (9*10^9*-4*10^(-6))/(.3) + (9*10^9*4*10^(-6))/(.5) = -48,000 V V_a - V_b = 96,000 V?

Homework Statement A +4.0 μC-point charge and a -4.0 μC point charge are placed as shown in the figure. What is the potential difference, V_A - V_B, between points A and B? (k = 1/4πε_0 = 8.99 × 10^9 N · m^2/C^2)...

I found that omega equals the square root of (k/m), and used it to find the answer. Thank you both!

Homework Statement A 15.0-N object is oscillating in simple harmonic motion at the end of an ideal vertical spring. Its vertical position y as a function of time t is given by y(t)=4.50 cos[(19.5s−1)t−π/8] in centimeters. What is the spring constant of the spring? Homework Equations y...