Total charge Definition and 62 Threads

Homework Statement A sphere of radius R=0.0850 m is made up of insulating material and has a spherically symmetric charge distribution. The radial component of the electric field inside the sphere is given by: Er= (-5.20E4) r3, for r ≤ R, where Er is in N/C when r is in meters and...

Homework Statement A square loop, side a, resistance R, lies a distance s from an infinite straight wire that carries current I. Now someone cuts the wire, so that I drops to zero. In what direction does the induced current in the square loop flow, and what total charge passes a given point...

Homework Statement A thin rod of length L with total charge Q. Find an expression for the electric field E at distance x from the end of the rod. Give your answer in component form. Homework Equations Well this isn't a infinite line of charge so this formula should work: E =...

Homework Statement A conducting sphere of radius a, at potential V0, is surrounded by a thin concentric spherical shell of radius b over which someone has glued a surface charge. sigma = kcos(theta) where k is a constant i know V(r, theta) and induced surface charge on the conductor...

Homework Statement The total charge that has entered a circuit element is q(t)=2(3 − e^{-4t}) when t≥0 and q(t)=0 when t<0. Determine the current in this circuit element for t≥0. Homework Equations Differentiation The Attempt at a Solution i(t) = 2(4e^{-4t}) + 3 - e^{-4t}...

A 12-V car battery is rated at 120 Ah. Assuming that the terminal voltage remains 12 V, for how long can this battery supply power at 29 W? How much charge flows through this battery in this time? How much energy is initially stored in the battery? I know that an Amp Hour is 3600 C I...

Question: A metal sphere of radius R carries a total charge Q. What is the force of repulsion between the "northen" hemisphere and the "southern" hemisphere? The force for a small area 'da' on the outer surface should be df = \sigma da E What E to use? My guess is that it should be averaged...

I don't know much about science, but I got a problem on my math homework that says "find the total charge. then decide whether you have an atom or an ion". Sodium:Electrons-10 Protons-11 Total Charge-? Atom or Ion?-? Sodium:Electrons-11...

alright, so i got this potentional equation \Phi = k_e Q e^{-\alpha r}/r it askes me to find the total charge after calcing the charge density, so anyway...lets get the field \vec{E}=-\nabla \Phi so yea then take the divergence fot the charge density \nabla \bullet \vec{E} = 4 \pi k_e p...

An electric current is given by the expression I ( t ) = 115 sin(120t), where I is in amperes and t is in seconds. What is the total charge carried by the current from t = 0 to t = 1/120 s? >> Since I = deltaQ/deltaT I rearranged and solved for Q = I(deltaT). Then I took T=0 and...

this is killing me. the question ask for total charge ina given volume of water. -first convert the volume to m^3 from cm^3 since i know the density of water at 4 degree cel (most dense) is 1000kg/m^3. -then imultiply the m^3 by 1000kg/m^3. then convert it to grams. - divide by 18...

Is the total electric charge of the universe zero? Positive? Negative? Is the charge conjugation symmetry broken in the elementary particles?