Physics Current Electricity Level: High School
The circuit in the figure which is shown at “click here” is composed of two batteries (V1=4V and V2 = 9V) and four resistors (R1 = 110 ohm, R2 = 40 ohm, R3 = 50 ohm, and R4 = 50 ohm ) as shown .(a) What is the current which flows through R1 ?
(b) What is the current I 3 that flows through R3 ?
Physics Electrostatics Level: High School
A defibrillator is used to restart a person’s heart after it stops beating . Energ is delivered to the heart by discharging a capacitor through the body tissues near the heart . If the capacitance of the defibrillator is 9 microF and the energy delivered is to be 300 J , to what potential difference must the capacitor be charged ?
Physics Electrostatics Level: High School
A parallel plate capacitor has a charge of 0.020 microC on each plate with a potential difference of 240 V. The parallel plates are separated by 0.40 mm of air . What energy is stored in this capacitor ?
Physics Electrostatics Level: High School
To make a parallel plate capacitor , you have available two flat plates of aluminum (area 120 cm^2) , a sheet of paper (thickness = .100 mm, k = 3.5), a sheet of glass (thickness 2.0 mm, k = 7.0), and a slab of paraffin (thickness = 10.0 mm , k=2.0). What is the largest capacitance possible using one of these diaelectrics ? What is the smallest ?
Physics Electrostatics Level: High School
A parallel plate capacitor has a capacitance of 1.30 nF. There is a charge of magnitude 0.800 microC on each plate . What is the potential difference between the plates ? If the plate separation is doubled , while the charge is kept constant , what will happen to the potential difference ?
Physics Electrostatics Level: High School
A helium nucleus (charge +2 e) moves through a potential difference deltaV = -0.50 kV . Its initial kinetic energy is 1.20 x 10^-16J . What is the final kinetic energy ?
Physics Electrostatics Level: High School
In a region where there is an electric field , the electric force do +8.0 x 10^-19 J of work on an electron as it moves from point X to point Y. Which point , X or Y is at a higher potential ? What is the potential difference , Vy – Vx, between point Y and point X ?
Physics Electrostatics Level: High School
Charges of +2.0 nC and -1.0 nC are located at the opposite corners of a square with side lengths of 1.0 cm . What is the electric potential at a third corner of the square (X) where there is no charge ?
Physics Electrostatics Level: High School
Two point charges ,are located 8cm apart on the X-axis . The charge at the origin is +10.0nC and the charge at the 8cm mark is -10.0 nC . What is the total electric potential energy of the three charges when a third point charge of -4.2 nC is placed 4.0 cm to the left of the origin , at 4cm on the X-axis (between the two existing charges) , and at a point above both points so that the three points together form an equilateral triangle with side lengths of 8.0 cm . (Let U =0 when all three charges are separated by an infinite distance . )
Physics Electrostatics Level: High School
A 4microC charge is separated by a dist . of 20 cm . from a 3 microC charge . A third charge of 2 microC is placed at 20 cm . from the other 2 charges . They form a Equilateral Triangle . Find the magnitude and direction of the electric field at the 2 microC charge .
Physics Electrostatics Level: High School
Two 3 gram balloons are suspended from a nail by strings 50 cm . long . Each balloon has a +q , and there is an angle of 40 degrees between the strings . Find charge q on each balloon ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
A long hollow conductor ( inner radius = 2mm , outer radius = 5mm) carries a current of uniformly distributed over its cross section . At what distance from the axis of the conductor is the magnitude of the magnetic field half of what it is on the conductors outer surface ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
A triangular coil consist of 50 turns and is in presence of a 20 T magnetic field . The coil contains a current of 15 mA and experience a maximum torque of 2000 Nm as a result of the magnetic field . If the coil is in the shape of an equilateral triangle , determine the dimensions of the coil .
Physics Current Electricity Level: High School
Determine the power dissipated by each resistor in the attached circuit .
Physics Electrostatics Level: High School
A rod with a circlar cross section in made of aluminium and has a length of 15 km and a cross – sectional radius of 12 mm. the ends of the rod are connected to the terminals of a 20 V battery . Determine(a) the resistance of the rod
(b) the current flowing across the rod
