You have built a device that measures the temperature outside and displays it on a dial as a measure of how far away from room temperature outside is. The way the dial works is that a needle with a charged ball on the end is placed between two charged parallel plates. The strength of the uniform electric field between the plates is proportional to the outside temperature. Given that the charged ball on the needle has a charge of -2.4 µC and the needle can be represented as a string with tension 0.350 N, and is at an angle of 14°, consider the following. + -9 What is the mass of the object? g 01 1 1 1 T 1-9 mg free-body diagram

Two parallel, flat, conducting plates with equal but opposite charges are separated by a uniform layer of insulating material with a dielectric constant of 7.1 and a thickness of 1.7mmmm. The electric field in the dielectric material is 2.22MV/mMV/m. What is the magnitude, in microcoulombs per squared meter, of the surface charge density on the conducting plates? What is the magnitude, in microcoulombs per squared meter, of the surface charge density on the conducting plates?

An irregular neutral conductor has a hollow cavity inside of it and is insulated from its surroundings. An excess charge of 18.0 nCnC is sprayed onto this conductor. 1.Find the charge on the inner surface of the conductor.Express your answer in nanocoulombs. 2.Find the charge on the outer surface of the conductor.Express your answer in nanocoulombs. 3.Without touching the conductor, a charge of -15.0 nCnC is inserted into the cavity through a small hole in the conductor. Find the charge on the inner surface of the conductor in this case.Express your answer in nanocoulombs. 4.Find the charge on the outer surface of the conductor in this case.Express your answer in nanocoulombs.

Now it's your turn Four charged particles are placed so that each particle is at the corner of a square. The sides of the square are 15 cm. The charge at the upper left corner is +3.0 µC, the charge at the upper right corner is -6.0 μC, the charge at the lower left corner is -2.4 µC, and the charge at the lower right corner is -9.0 μC. a. What is the net electric force on the +3.0 µC charge? b. What is the net electric force on the -6.0 µC charge? c. What is the net electric force on the-9.0 uC charge?

33b. A slab of insulating material of uniform thickness ddd, lying between −d/2 to +d/2 along the x axis, extends infinitely in the y and z directions, as shown in the figure. The slab has a uniform charge density ρ. The electric field is zero in the middle of the slab, at x=0. What is the angle θ that the field  E→ makes with the surface of the slab, which is perpendicular to the x direction? Express the answer in radians.

Two conducting hollow spheres share a common center. The inner sphere has the radius a = 5.0 cm and charge +3.2x10-6 C. The outer sphere has the radius b = 32 cm and charge -4.0x10-6 C. What is the electric field (in N/C) at a point P, r = 20 cm from the center of the spheres?