*** 27. Two circular discs form the plates of a capacitor that is placed in a circuit in which a current I = 3 amps is going to the right. Each plate has an area of 10-2 m2. The distance between the plates is 1 cm.
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- If gold (PAu = 2.44 x 10-8 N. m) and silver (PAg = 1.59 × 10-8 n. m) wires of equal length are found to have the same resistance. 4 a) Find the ratio of their radii (rAL/r Cu)? b) Which element (Au or silver) is better for conducting electrical current? Explain. LEGOA scientist just bought a very cool magnet, and would like to measure it’s strength. She takes a stripof copper with width 3.0cm, and a rectangular cross-section of 0.004m^2 and runs a current of 0.5Athrough it. She knows copper has a free charge density of 8.491× 10^28 m−3. She holds the magnetnear the strip, and measures a voltage across the sides of the strips, and her voltmeter reads 11.2 nV-what is the strength of her magnet?Consider the circuit shown in the figure. A short time after closing the switch, the charge on the capacitor is 70.0% of its initial charge. Assume the circuit has a time constant of 18.7 s. +Q (a) Calculate the time interval required (in s) for the capacitor to reach this charge. (b) If R = 300 kn, what is the value of C (in uF)? UF
- Consider the circuit shown. The currents are already drawn for you. b R3 C d 3.002 R4 V1 V2 6.002 6.00V 9.00V I2 13 R1 5.002 R2 V3 4.002 12.0V R5 a f e 2.002When the switch is open, the potential difference across the terminals of a battery is 20 0.0V. When a current of 2.0A flows, the potential difference across the battery drop to 16V. If this battery consists of two identical cells in series, what is the electromotive force of each cell? 8.0V 10.0V 16.0V 20.0VA resistor composed of carbon =(p=3.5*10^5 Ω*m) having a radius of 1.2mm and a length of 3.1mm is connected to a 6V batter. How much energy is dissipated by the resistor in 5 minutes?
- 18. According to Wolff's law, detailed by Julius Wolff in the late 19th Century, bones in the human body "remodel" themselves based on stresses and strains they are placed under. While the exact mechanism for this process is unknown, a piezoelectric response in which the bone develops electric charge and electric current when placed under stress is suspected. Electric stimulation by a 100 μA/cm² current has also been shown to accelerate bone repair and regeneration after a fracture. The resistivity of human bone is 170 2 m. Assume bone is an ohmic conductor. b) a) establish What is the potential difference (in V) that is needed to establish a current with density 100 μA/cm² over a 4.98 cm-long segment of the tibia, the shin bone, with a diameter of 2.70 cm? What is the magnitude of the magnetic field (in T) generated by the current in this segment at a radial distance of 10.2 cm from the center-point of the segment?When you first connect a capacitor to a working circuit, no charge has built up across the plates, so the capacitor allows charges to flow freely. After a long time, the capacitor has built up its maximum charge, and no more current will flow onto the device. Which equation or theory is this based on?A caterpillar of length 6.00 cm crawls in the direction of electron drift along a 8.20-mm-diameter bare copper wire that carries a uniform current of 38.0 A. (a) What is the potential difference between the two ends of the caterpillar? (b) Is its tail positive or negative relative to its head? (c) How much time does the caterpillar take to crawl 2.30 cm if it crawls at the drift speed of the electrons in the wire? (The number of charge carriers per unit volume is 8.49 × 1028 m-3 and resistivity of copper is 1.69 × 10-8 Ω·m.)