A small plastic ball is connected to a lightweight cord of length L = 1.60 m that is tied to a point P, as shown in the figure. y = 0 + 9 L. Top view The ball, string, and point all lie on a frictionless, horizontal table. The ball has a mass m = 0.0100 kg, a charge q = +2.50 µc and is released from rest when the string makes an angle o = 60.0° with a uniform electric field of magnitude E = 320 V/m. Determine the speed (in m/s) of the ball when the string is parallel to the electric field. m/s Need Help? Read It

An eletrostatic paint sprayer consists of a charged metal sphere. Charged paint droplets (the sign the same as the metal sphere) are shot towards the metal sphere using a paint gun. The paint droplets repel and move towards a grounded object that needs to be painted. In the figure below, an electrostatic paint sprayer has a 0.25 m diameter metal sphere at a potential Vsphere of 23 kV that repels paint droplets onto a grounded wall.  a) What charge is on the sphere? b)    What charge must a 0.14 mg drop of paint have to arrive at the object with a speed of 12 ms?

Two equal charges are situated on the x axis at 40.0 cm on either side of the origin as shown in the figure below. Location A is on the perpendicular bisector at a distance of 21.0 cm from the origin on the y axis. (Assume that the +x axis is directed to the right and they axis is directed up.) 91 *A 92 (a) If q,- -3.50 C and q,- -3.50 C what is the net electric field due to both charges at location A? Express your answer in vector form. 1.64-10%) x Did you consider the symmetry of the situation? What is the net contribution to the field from the x components of the field from each charge? N/C (b) If a, 3a, (where q,- -3.50 pC), what is the net electric field at location A due to both charges? Express your answer in vector form -4.68-10%-4.1-10% x If the two charges are unequal, what is the net contribution to the field from each charge in the two perpendicular directions? N/C

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Ch 18 q3 In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic structure and led Rutherford to propose the existence of a very dense concentration of positive charge at the center of an atom—the atomic nucleus. The alpha particle has a charge of +2e and the gold nucleus a charge of +79e. Suppose that an alpha particle is initially a great distance from the gold, has a kinetic energy of 4.20 MeV (4.20  106 eV), and is headed directly at a gold nucleus. How close will the particle come to the center of the nucleus? Treat the nucleus and the alpha particle as point charges.

1. An eletrostatic paint sprayer consists of a charged metal sphere. Charged paint droplets (the sign the same as the metal sphere) are shot towards the metal sphere using a paint gun. The paint droplets repel and move towards a grounded object that needs to be painted. In the figure below, an electrostatic paint sprayer has a 0.2 m diameter metal sphere at a potential V sphere of 27 kV that repels paint droplets onto a grounded wall. Vwall =0 paint drop repelled to the wall V Vsphere Electrostatic Paint Sprayer (a) What charge is on the sphere? Qsphere (b) What charge must a 0.05 mg drop of paint have to arrive at the object with a speed of 14 S 9 drop C

THE FIGURE BELOW SHOWS A CROSS SECTION OF TWO LONG, THIN COAXIAL CYLINDERS OF RADIUS a AND b. THE CYLINDERS CONTAIN EQUAL CHARGES A PER UNIT LENGTH AND OPPOSITE SIGNS. A POSITRON ROTATES IN A CIRCULAR PATH BETWEEN THE CYLINDERS AND CONCENTRIC TO THEM. FIND ITS KINETIC ENERGY FOR À= 30 nC/m

Chapter 19: Question on conservation A charge of -4.25 μC is fixed in place. From a horizontal distance of 0.0531 m, a particle of mass 8.03 x 103 kg and charge-9.69 μC is fired with an initial speed of 63.3 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero?