Exp 2-02

only 3

Question 6 a) Assuming an infinite plate capacitor model, determine the force on an electron between the plates. b) Find the change in potential energy of a negatively charged object of -2 nC as it moves from the -3 V plate to the -12 V plate. What kind of system is this? Why? c) Find the voltage and potential energy of this object when its 1 cm away from the -12 V plate. Note voltage should take into account one of the voltages of the plates. d) Now let's assume V(x) = -13 + e57.6x (V) from the -12 V plate to -3 V plate. Sketch this function and compute and sketch the corresponding Electric Field. Hint: Use values at 0, 1 cm, 2 cm, 3 cm and 4 cm to get an idea of the exponential function shape.

5) ) The point charge at the bottom of the figure is, Q = 17 nC and the curve is a circular arc, of radius r = 5 cm. What is the magnitude of the force on the charge Q due to the other point charges shown? -6.0 nC 2.0 nC 2.0 nC 45° 45° 5.0 cm 5.0 cm +) Explain or Show Work Here:

Why electrons are more mobile than the holes? Please explain

3. An insulator is in the form of a linear curve (in the unit of meter) with the parametric equations of: x(0) = 4(20-sin 20) and y(0) = 8sin²0 The insulator is charged with a constant linear charge density of p=5 μC/m. Find the total charge between 0 = 0 and 0 - (hint: find the length of the curve first)

Four point charges are placed at corners of a square . At the top left is a charge of - 1 C, at the top right is a charge of - 2 C, at the bottom right is a charge of -3 Cand at the bottom left is a charge of - 4 C. What is the direction of the net electric force due to the four point charges on a positive charge Q located at the center of square ? O due North O due South O Sw O SE

Charges A andB are placed a distance of 1.5m from one another. The charge of particle A is 0.3 C whereas the charge of particle B is 0.4 C. Charge B experiences an electrostatic force of FB from charge A. Similarly, charge A experiences an electrostatic force of FA from charge B. What is the ratio of FA to FB?

Discussions:Voltage Distribution and String Efficiency of a Model Suspension Insulator       1- Comment on the results obtained.2- Give reasons for unequal potential distribution over the string.3- What is the effect of this un equality on the insulators?4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?

b) chose from column A what is suitable for column B: 1- 2- 3- 4- 5- A Matter Atom Current Resistance Electricity B Is an invisible force that can produce light, heat by attraction. The opposition or restriction the flow of charge and measured by ohm. The rate of flow of charge and measured by ampere. Is generally described as anything that has weight and occupies space. Is the smallest particle to which an element can be reduced.

Consider the arrangement of the point charges shown below. Charge q1 has a value of 6.00 CC and charge q2 has a value of -1.00 CC .  What will be the magnitude and direction of the force on the electron at the bottom if the other charges are held in place? a) The magnitude of the force on the electron will be: b) The electron will experience the force at an angle of: (note the +x-axis is defined as 0 degrees.

Question 3 a. Some materials exhibit the property of superconductivity under certain conditions. State what is meant by superconductivity and explain the required conditions for the material to become superconducting. b. The diagram below shows the cross-section of a cable consisting of parallel filaments that can be made superconducting, embedded in a cylinder of copper. copper cylinder filament The cross-sectional area of the copper in the cable is 2.28 x 10-7 m². The resistance of the copper in a 1.0 m length of the cable is 0.075 N. Calculate the resistivity of the copper, stating an appropriate unit. State and explain the what happen to the resistance of the cable when the embedded filaments of wire are made superconductive? i.