Physics Current Electricity Level: High School
A certain ammeter has a resistance of 0.0020 ohms . By mistakes a student connects it directly across a 1.50 V dry cell . (He though it was a volt meter and was using it to measure the cell voltage ) How much current flows through the meter before it burns out ? ( In a case like this the wires inside the meter would becomes so hot they would melt )
Physics Electrostatics Level: High School
The current through a certain lighted light bulb is 0.50 A . How much charge flows through the bulb each second ? How many electrons flow through the bulb each second ?
Physics Electrostatics Level: High School
The electric field between two parallel metal plates is 3 x 10 to the 4th V/m . Consider two equipotential planes between the plates . We wish the potential difference between them to be 10 V . How far apart are these two equipotential planes ?
Physics Electrostatics Level: High School
In a TV tube , the beam shoots between two charged . closely spaced ,parallel metal plates . The electric field between the plates deflects the beam across the TV screen . If the potential difference between the plates is 140 V , how large is E between them ? The gap between the plates is 1.50 mm .
Physics Electrostatics Level: High School
A cylinder capacitor consists of two concentric metal cylinders . The cylinders are 20 cm long . they have a 0.10 mm gap between them , and the outer radius of the inner cylinder is 3 cm . What is the approximate capacitance of this capacitor ?
Physics Electrostatics Level: High School
What must be the capacitance of a device that is to hold a charge of 2 micro C when 1000 V is impressed across it ?
Physics Electrostatics Level: High School
A potential difference of 25 V exists across a 0.75 micro F capacitor . How large is the charge on the capacitor ?
Physics Electrostatics Level: High School
An electron is projected into a uniform electric field that has a magnitude of 5000 NC . The direction of the field is vertically upward . The initial velocity of the electron has a magnitude of 6.0*10^6 m/s and direction is at an angle of 30 degrees above the horz.a) Find maximum distant the electron rises vertically above its initial elevation.
b) After what horz distance does the electron return to its original elevation .
c) sketch the trajectory of the electron .
Physics Electrostatics Level: High School
In a rectangle coordinate system a charge with a magnitude of 2.50*10^-8 C is placed at point x = +.1 m y = 0 and an identical point charge placed at x = -.1m , y = 0 . Find magnitude and direction of the electric field at the following points .a) Origin
b) x =. 2m , y = 0
c) x = 1m, y = .15 m
d) x = 0, y = .1 m
Physics Electrostatics Level: High School
A uniform electric field exists in the region between two oppositely charged plane parallel plates . An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate 3.2 cm distant from the first , in a time interval of 1.5 *10^-8 sec .a) Find the electric field magnitude .
b) Find the speed of the electron when it strikes the second plate .
Physics Electrostatics Level: High School
A 30 micro F capacitor is charged to 80 V and then connected across an initial uncharged capacitor of unknown capacitance C . If the final potential difference across the 30 micro F capacitor is 20 V , determine C .Bonus : Charge of uniform density (3.5 nC/m) is distributed along the circular are shown in the figure at “click here” . Determine the electric potential (relative to zero at infinity) at point P .
Physics Electrostatics Level: High School
A parallel plate capacitor of capacitance Co has plates of area A with separation d between them . When it is connected to a battery of voltage Vo , it has charge of magnitude Qo on its plates . While it is connected to the battery the space between the plates is filled with a material of dielectric constant 3 . After the dielectric added , Find the magnitude of the charge on the plates and the potential difference between them .
Physics Electrostatics Level: High School
If C = 50 nF , determine the equivalent capacitance for the combination shown in the figure at ‘click here’ .
Physics Electrostatics Level: High School
Point charges q and Q are positioned as shown in the figure at “click here” . If q = +2.0 nC , Q = -2.0 nC , a = 3.0 m , and b = 4.0 m , What is the electric potential difference , VA - VB ?
Physics Electrostatics Level: High School
Points A [at (2,3) m] and B [at (5,7) m] are in a region where electric field is uniform and given by E = (4i + 3J) N/C . What is the potential difference VA – VB ?