Physics

Electric Field and Potential

Q3: A proton is moving with a certain kinetic energy when it encounters the boundary of a region in which there is a different voltage (leading to a potential energy). For each of the following kinetic and potential energy values, determine the probability with which the proton will reflect from the boundary: (a) 9 eV & 5 eV (b) 4 eV & -5 eV (c) 9 eV & 25 eV

Objects 1 and 2 attract each other with a electrostatic force a of 36.0 units. If the distance separating Objects 1 and 2 is changed to one-third the original value, then the new electrostatic force will be units.

Objects 1 and 2 attract each other with a electrostatic force of 72.0 units. If the charge of Object 1 is halved AND the charge of object 2 is tripled, then the new electrostatic force will be units.

7. [-12 Points] DETAILS OSCOLPHYS2016 19.2.WA.013. MY NOTES ASK YOUR TEACHER Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 6.65 cm from the zero volt plate (and 3.35 cm from the other) is 553 V? kV/m (b) What is the voltage between the plates? Additional Materials Reading

11. [-12 Points] DETAILS OSCOLPHYS2016 18.4.WA.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER To study the properties of various particles, you can accelerate the particles with electric fields. A positron is a particle with the same mass as an electron but the opposite charge (te). If a positron is accelerated by a constant electric field of magnitude 315 N/C, find the following. (a) Find the acceleration of the positron. m/s2 (b) Find the positron's speed after 9.25 x 10-ºs. Assume that the positron started from rest. m/s Additional Materials Reading

6. [-/1 Points] DETAILS OSCOLPHYS2016 18.2.P.009. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER How many coulombs of positive charge are there in 7.30 kg of plutonium, given its atomic mass is 244 and that each plutonium atom has 94 protons? C + Additional Materials Reading

Two stationary positive point charges, charge 1 of magnitude 3.15 nC and charge 2 of magnitude 1.60 nC, are separated by a distance of 54.0 cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.

An elliptical cavity is charge within perfect conductors. A positive charge q is placed at the centre of the cavity. The points A and B are on the cavity surface as shown, Then: A 9. B = A. Electric field near A in the cavity = electric field near B in the cavity. = B. Charge density at A= charge density at B.

12. A 125 2 resistor and a 150 Q resistor are connected in series to a 75 V battery. Assuming that the internal resistance of the battery can be neglected, what is the current flowing through each resistor? A. not enough data to find out B. 0.1 A C. 0.272 A D. None of the abova

As an electron moves in the direction of the electric field lines it is moving from low potential to high potential and gaining electric potential energy. it is moving from low potential to high potential and losing electric potential energy. it is moving from high potential to low potential and gaining electric potential energy. it is moving from high potential to low potential and losing electric potential energy. both its electric potential and electric potential energy remain constant.

= E F W 2 An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (enter X, Y, Z, or W) will the electron follow in the field? A

Two equally charged, identical metal spheres A and B repel each other with a force 'F'. The spheres are kept fixed with a distance 'r' between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is Correct Answer A. F. B. 3F/4 C. F/2 D. F/4

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