An insulating belt moves at speed 30 m/s and has a width of 50 cm. It carries charge into an experimental device at a rate corresponding to 100 mA.What is the surface charge density on the belt?

The voltage across a membrane forming a cell wall is 77.7 mV and the membrane is 9.02 nm thick. What is the electric field strength? (The value is surprisingly large, but correct.) You may assume a uniform E-field.

The vertical deflecting plates of a typical classroom oscilloscope are a pair of parallel square metal plates carrying equal but opposite charges. The potential difference between the plates is 25.0 V. Typical dimensions are about 3.3 cm on a side, with a separation of about 5.0 mm. The plates are close enough that we can ignore fringing at the ends. Part A:Under these conditions, how much charge is on each plate? Q=__C Part B:How strong is the electric field between the plates? E=__V/m Part C:If an electron is ejected at rest from the negative plates, how fast is it moving when it reaches the positive plate?v=__m/s

Four equal positive charges, of magnitude 10-6 C are situated at the corners of a square, with a length of side equal to 0.25m. A small test charge of 10-9 C is placed at location X, in the exact center of the square. What is the magnitude of the potential energy of the test charge and what is the voltage at X? If the test charge is released what is its final velocity, taking its mass to be 1.5g?

Q. The ends of the cylinder are made of conducting discs and the space between these discs are filled with an inhomogeneous ohmic medium whose conductivity o = L/(z+1). Where L is the separation distance of the discs. A d-c voltage Vo is applied across the discs as shown on the right. Determine V. a) The total resistance between the discs b) The surface charge densities on the discs c) The volume charge density and the total amount of charge between the discs

Part A and Part B please  A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has radius 12.0 cm, and the outer sphere has radius 15.0 cm. A potential difference of 110 V V is applied to the capacitor. Part A What is the energy density at r = 12.1 cm, just outside the inner sphere?  Part B What is the energy density at r = 14.9 cm, just inside the outer sphere?

A 3.3-cmcm-diameter parallel-plate capacitor has a 1.7 mmmm spacing. The electric field strength inside the capacitor is 1.1×105 V/mV/m .

How is charging by induction different than charging by conduction? Select one: O Charging by induction usually involves more than one step. O Charging by induction always ends up with two negatively charged objects. O Charging by induction always ends up with two positively charged objects. O Charging by induction can only involve conductors.

A 9.0-nm-thick cell membrane undergoes an action potential that follows the curve in the table given. What is the strength of the electric field inside the membrane just before the action potential and at the peak of the depolarization?

Current Attempt in Progress Figure (a) gives the magnitude E(x) of the electric fields that have been set up by a battery along a resistive rod of length L = 9.00 mm (see Figure (b)). The vertical scale is set by E, - 5.20 x10³ V/m. The rod consists of three sections of the same material but with different radii. (The schematic diagram of the figure (b) below does not indicate the different radii.) The radius of section 3 is 2.01 mm. What is the radius of (a) section 1 and (b) section 2? 3 Ⓡ x (mm) x= L