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A +2.00-nC point charge is at the origin, and a second-5.00-nC point charge is on the x-axis at x = 0.8m. A) Findthe electric field(magnitude and direction) at each of thefollowing points on the x axis. i) x-2.00m; ii) x=1.2m iii) x= -0.2m. b) Find the net electric force that the two chargeswould exert on an electron placed at each point in part a).
A cell of e.m.f E and Internal Resistance r, r connected in series with a resistor and ammeter, A current of 0.8A is Observed to pass when the resistor is 2ohm when another resistor of 5 ohms is connected in parallel with the 2ohms resistor, the new ammeter reading is 1.0A.

a. Draw circuit diagram to illustrate the two arragement
b. using circuit diagram drawn in a above write down the equation for e.m.f E of the cell in each case.
c. calculate the internal resistance and e.m.f of the cell
Cells A and B and a galvanometer G are connected to a slide wire OS by two sliding contacts X and Y. The slide wire is 10cm long and has a resistance of 12ohm. With OY 75cm,the galvanometer shows no deflection when OX is 50cm. If Y is moved to touch the end of the wire at S,the value of OX which gives no deflection is 62.5cm. Emf of cell B is 1V. Calculate: a. The p.d across OY when Y is 75cm from O with null deflection. B. The p.d. across OS when Y touches S with null deflection. C. The internal resistance of cell A. d. The emf of cell A
Two particles each of mass M is attached to 2ends of a massless rigid nonconducting rod of length L. They have +q and -q charges respectively. This arrangement is held in a region of uniform electric field E such that the rod makes a small angle (<5°) with the field direction. The time period of rod is__? (The rod oscillates about its centre of mass)
Ans) 2*pi* sqroot(ML/2qE)
Please solve...
The force between two identical spheres each having charge q at some distance apart is F.third identical spher is brought firstly in contact with A and then with B finally removed. What is the force between the first two spheres?
(a) Here is the information about the circuit.
Capacitor = 100 nF
Resistor = 47 kΩ
Supply voltage = 5 V
Charging characteristic for a series capacitive circuit: v(1-e^-t/rc)
where T  CR and is called the time constant.
 Investigate what the other terms in this expression mean.
 Calculate the time constant for the circuit.
 Use a spreadsheet to plot the charging curve over the range 0 to 20 ms (milliseconds).
 Investigate the meaning of ‘time constant’ and from your graph estimate a value. Compare this with your calculated one.
 Differentiate the charging equation and find the rate of change of voltage at 6 ms.
 From your graph measure the gradient at 6 ms and compare this with the calculated value.


(b) Now investigate the discharging characteristic of the circuit but with a 22 kΩ resistor fitted.
 Calculate and estimate the rate of change of voltage when t = T.
(a) Here is the information about the circuit.
Capacitor = 100 nF
Resistor = 47 kΩ
Supply voltage = 5 V
Charging characteristic for a series capacitive circuit: v(1-e^-t/rc)
where T  CR and is called the time constant.
 Investigate what the other terms in this expression mean.
 Calculate the time constant for the circuit.
 Use a spreadsheet to plot the charging curve over the range 0 to 20 ms (milliseconds).
 Investigate the meaning of ‘time constant’ and from your graph estimate a value. Compare this with your calculated one.
 Differentiate the charging equation and find the rate of change of voltage at 6 ms.
 From your graph measure the gradient at 6 ms and compare this with the calculated value.


(b) Now investigate the discharging characteristic of the circuit but with a 22 kΩ resistor fitted.
 Calculate and estimate the rate of change of voltage when t = T.
The maximum current rating for a 10 kilo ohms, 0.5 W resistor is
Resistors of 5 ohms and 10 ohms are connected in series with a battery supplying 3 volts.
What is the total resistance ?
A capacitor of capacitance 100muF & a ressistance of 100ohm is connected in series with AC supply of 220V, 50hZ. THE CURRENT LEADS THE VOLTAGE BY????