Physics Answers

11– 20. A hydrogen atom consists of a single proton and a single

electron. The proton has a charge of +e and the

electron has −e. In the “ground state” of the atom, the electron orbits

the proton at most probable distance of

7.48 × 10−11 m (as shown in the figure below). Calculate the electric

force on the electron due to the proton?

Three capacitors of capacitances C1 = 15 μF, C2 = 30 μF, and C3 = 45μF were connected in series to a potential difference V. Find the equivalent capacitance of the three capacitors.

Determine the capacitance of a spherical air-filled capacitor of radius, 𝑅_1 = 2.5 c𝑚 and 𝑅_2= 0.45 d𝑚.

An amount of charge is distributed uniformly throughout a spherical shell that has a diameter 0.52m. At the center, there is a point charge q = 70 μC. Find the electric field outside the shell.

An infinitely long line of charge carries 75 pC along each 1 meter of length. Find the electric field 0.40 m from the line of charge.

Two point charges are located on the x-axis of a coordinate system: 𝑞_1 =-1.5 𝑛𝐶 is at 𝑥 = +4.0 𝑐𝑚, and 𝑞_2=−3.5 𝑛𝐶 is at 𝑥 = +2.0 𝑐𝑚. What is the total electric force exerted by 𝑞_1 and 𝑞_2 on a 𝑞_3= 2.0 𝑛𝐶 at 𝑥 = +3 cm?

Force between two point charges: Two point charges,

and , are separated by a distance

(Refer to the figure below). Find the magnitude

and direction of the electric force (a) that exerts on and (b)

that exerts on .

A certain fluid at 10 bar is contained in a cylinder behind a piston, the initial volume being 0.05^m3. Calculate the work done by the fluid when it expands reversibly according to linear law to a final volume of 0.2m^3 and a final pressure of 2 bars.

The viscosity of a fluid is to be measured by a viscometer constructed of two 3m long concentric cylinders.the inner diameter of the outer cylinder is 35cm, and the gap between the two cylinders is 0.14cm.the outer cylinder is rotated at 250rpm. and the torque is measured to be 1.8N determine the viscosity of the fluid

Determine the precision of these two approximate values

a) 32000.Tons

b) 1.20×10(--5)ms