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1. ### I have V, and current for different lengths. I can get R with R=V/length. How does cross sectional area relate to the R vs. length graph?

It is not true that R=V/length. You can get resistance R = V / I where... suspect that it is to calculate the resistivity ρ of the wire material. R = ρℓ / A so, if you plot R (vertical) vs ℓ/A...

2 Answers · Science & Mathematics · 11/09/2019

2. ### Physics Problem: What is the resistance R in the figure? / What is the emf of the battery in the figure?

The voltages across the middle branch (R) and across the right hand branch (R+10) are equal as the branches...

3 Answers · Science & Mathematics · 19/08/2019

3. ### For a point charge, how does the potential vary with distance from the point charge, r?

Potential from a charge is V = kQ/r in volts k = 1/4πε₀ = 8.99e9 Nm²/C² r is separation in meters q is charge in coulombs so the relationship is inverse, c

1 Answers · Science & Mathematics · 06/03/2019

4. ### Magnitude of the electric field created by changing magnetic field at radial distance r = 0.20 m from the magnetic field center?

E 2 π r = - dΦ(B)/dt E = - [1 / (2 π r)] dΦ(B)/dt B = Bo - k t dΦ(B)/dt = π r^2 dB/dt = - k π r^2 E = 1/2 k r E = 0.5*0.3*0.2 = 3x10^-2 V/m

1 Answers · Science & Mathematics · 30/04/2019

5. ### force of attraction b/w two particles is f=k*[(r2-r1)-r/v(r2-r1)] where k is constant, vis velocity, and r= r2-r1, is system conservative?

Yes. r, r1 and r2 do not depend on time explicitly. Therefore the motion is conservative.

2 Answers · Science & Mathematics · 23/02/2019

6. ### What is the volume Vball of the ball (radius R) with charge q?

... is the volume VG of the Gaussian sphere (radius R) … “ should be: “What is the volume VG of the Gaussian...

2 Answers · Science & Mathematics · 10/09/2019

7. ### Identical satellites X and Y of mass m are in circular orbits around a planet of mass M. The radius of the planet is R.?

...proof, start with gravitational force = centripetal force GmM / R² = mv² / R and since KE = ½mv² GmM / R² = 2*KE...

1 Answers · Science & Mathematics · 07/05/2019

8. ### The next figure shows, in cross section, a plastic, spherical shell with uniform charge Q = −16e and radius R = 10 cm.?

... where k = 1/4πε₀ = 8.99e9 N·m²/C² For r < 10 cm, the outer shell of charge has no effect on the field...

1 Answers · Science & Mathematics · 12/09/2019

9. ### What would the force be if the separation between the two charges was adjusted to 7.31 ✕ 10-11m? (Physics)?

r = 7.31 *10^-11 m That's what it says. It is not r^2 = 7.31 *10^-11 m. r^2 = 5.34×10^-21 m --------------------- Did it not just...

3 Answers · Science & Mathematics · 05/02/2019

10. ### what is cos in terms in R and z?

cosΘ = adj / hyp = z / √(z²+R²)

1 Answers · Science & Mathematics · 05/09/2019