solve a,b and c please. In a concentric spherical electrode system, the outer radius is 15cm, the perforation of the insulator between the spheres since its resistance is 90 kV / cm, a) Obtain the equation for the breakdown voltage. b) Since 300kV is applied between the electrodes, r1 (inner radius) can be taken to prevent piercing of the system. what range are the values? c) What is the maximum voltage value that the system can withstand?

Diagram of the problem, necessary formulas, clearance and numerical solution. A steady current of 0.5 A flows through a wire. How much charge passes through the wire in one minute?

make an introduction of at least 30 lines about PROTOTYPE OF PIEZOELECTRIC BALLAST FOR GENERATING ELECTRIC ENERGY THROUGH THE PEDESTRIAN TRAFFIC

1) One theory about charging insulators is called adhesion. Look this up and explain (in about 3-4 sentences) why charge transfers between two insulators that are rubbed together. 2) Describe what happens to the charge on a neutral metal sphere if a charged rod is brought near (but not touching) the sphere. 3) Does the sphere in the previous question remain neutral?

The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance Ry is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure for finding the unknown resistance Rx is as follows. Measure resistance Ry between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R, between points A and C.

Why electrons are more mobile than the holes? Please explain

Difficult problem that I need some help on please

A platinum resistance temperature detector (RTD) is used to measured temperature of the hot gas. The resistance of sensing element is 250.3 ohm when it contact with hot gas, calculate the temperature of the gas. The RTD has a resistance of 120 ohm and 80 ohm at 100°C respectively. The temperature coefficient of platinum is 0.0039 C^-1.

Please ?....hy