A block in the shape of a rectangular solid has a cross-sectional area of 3.11 cm^2 across its width, a front-to-rear length of 11.9 cm, and a resistance of 716 ohm. The block's material contains 6.52
The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.27 mm is given by J = (3.29
A certain voltmeter has an internal resistance of 10,000 ohm and a range from 0 to 100 V. To give it a range from 0 to 1000 V, one should connect: Select one a. 90,000 ohm in series b. 1000 ohm in series c. 1000 ohm in parallel d. 100,000 ohm in series e. 100,000 ohm in parallel.
A battery of emf 24 V is connected to a 6.0-ohm resistor. As a result, current of 3.0 A exists in the resistor. The rate at which energy is being dissipated in the battery is: 6.0 W 3.0 W 72 W 54 W 18 W
The mechanical equivalent of heat is 1 cal = 4.18 J. The specific heat of water is 1 cal/g
Five cylindrical wires are made of the same material. Their lengths and radii are wire 1 : length l, radius r wire 2 : length 3l/2, radius r/2 wire 3 : length l/2, radius r/2 wire 4: length l, radius r/2 wire 5 : length 5l, radius r/2 Rank the wires according to their resistances, least to greatest.
In separate experiments, four different particles each start from far away with the same speed and impinge directly on a gold nucleus. The masses and charges of the particles are particle 1: mass m0, charge q0 particle 2 : mass 2m0, charge 2q0 particle 3: mass 2m0, charge q0/2 particle 4: mass m0/2, charge 2q0 Rank the particles according to the distance of closest approach to the gold nucleus, from smallest to largest.
A parallel-plate capacitor has a plate area of 0.30 m^2 and a plate separation of 0.10 mm. If the charge on each plate has a magnitude of 5.0
What is the net charge on the surface of a conducting sphere of radius 5.00 cm whose potential is -180 V (with V = 0.00 at infinity)?
Each plate of a capacitor stores a charge of magnitude 6mC when a 200-V potential difference is applied. If the charge is doubled and the plates are moved so that the potential is halved, how will the new capacitance compare to the original?
-9.69 × 10^-3 J of work is required to move 1.78 µC between points A and B. The work is done against the field. The electric potential difference between these two points is
A certain capacitor has a capacitance of 5 uF. While it is charged to 5 uC and isolated, the plates are pulled apart so its capacitance becomes 2 uF. The work done by the pulling agent is about
-9.66 × 10^-3 J of work is required to move 1.46 µC between points A and B. The field does positive work on the charge. The electric potential difference between these two points is
A current of 1.00 A flows in an aluminum bar which is 10.0 cm long and 1.00 cm square sides. If electrons drift through the bar at a speed of 3.50
A computer chip uses 1.0 × 10 5 electrons to store the charge associated with a single bit of information in a square cell within the chip that measures 1.0 × 10 − 6 m on each side. What is the current density associated with each cell if the computer writes 100 million bits per second, one after the other?
To demonstrate the ideas of electric current and resistivity the following experiment was conducted using a 10.0 m long 1.00 m diameter pipe. The pipe is connected to an air pump which produces high air pressure at one end. The other end of the pipe is open to the surrounding air, and the pump maintains a constant difference in air pressure between the two ends. Six hundred electrically charged ping pong balls are injected into the pipe with velocities that have random magnitudes and directions. Due to the difference in air pressure, the balls drift from the high pressure end of the pipe to the low pressure end at a speed of 2.00 cm/s. If every ping pong ball is given a charge of 6.00 microcoulombs, how much current flows through the pipe?
You want to use copper wire to carry a current of 20.00 A. You have a choice of wire in several different diameters, identified by their American Wire Gauge (AWG) numbers below. Safety concerns require that the current density in the wire must be less than 4.000x 10^6 A/m^2. Which of the wires listed below is the smallest diameter that will meet the requirements?
A beam of protons travelling at 1.00 x 10^5 m/s has a current density of 1.00 mA/m^2. What is the density of protons in the beam?
Assume current flows in a cylindrical conductor in such a way that the current density increases linearly with radius, from zero at the center to 1.0 A/m^2 at the surface of the conductor. If the conductor has a cross sectional area of 1.0 m^2, what can you say about the current in this conductor? The current is more than 1.0 A. The current is less than 1.0 A. The current is 1.0 A. Any of these choices might be correct.