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A closed curve encircles several conductors. The line integral
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Chapter 28 Solutions
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- A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each proton has a kinetic energy of 10.00 MeV. (a) What is the velocity of the protons? (b) What is the number (n) of protons per unit volume? (b) How many electrons pass a cross sectional area each second?arrow_forwardFour infinite wires passing through the vertices of a square with side-length of 2 /2 cm, holding the same current -18 as shown. What is the magnitude of B at the centre of the square (point A)? Select one: O a. 0.00187 T O b. 0.00748T O C. None Od. 0.00374 T O e. Zeroarrow_forwardYou know that Wires 1 and 2 are a distance, d = 0.81 m, apart and that they carry the same current, I = 18.7 A, in opposite directions. You also know that Wires 2 and 3 are a distance, x = 2.43 m, apart. What you don't know, but really need to find out, is... "How much current flows through Wire 3 -- and which way?" You would just measure the current, if your ammeter wasn't broken. Then you remembered the magnetometer that the Tooth Fairy left under your pillow last year, and realized that you could deduce the current in Wire 3 from the measured magnetic field strength! (b) Calculate the magnetic force per unit length that acts on the new wire. N/m x FB on 3 = 2.946e-6 L (c) Will Wire #3 be attracted or repelled by the other two? attract left O repel out (a) Using the magnetometer, you determined that the magnetic field midway between Wires 2 and 3 was 2.9 μT, and that it pointed straight upwards. What then is the size and direction of the current flowing through wire 3? 13 = 7.657 Ax…arrow_forward
- You know that Wires 1 and 2 are a distance, d = 0.81 m, apart and that they carry the same current, I = 18.7 A, in opposite directions. You also know that Wires 2 and 3 are a distance, x = 2.43 m, apart. What you don't know, but really need to find out, is... "How much current flows through Wire 3 -- and which way?" You would just measure the current, if your ammeter wasn't broken. Then you remembered the magnetometer that the Tooth Fairy left under your pillow last year, and realized that you could deduce the current in Wire 3 from the measured magnetic field strength! A and it flows ---Select--- ---Select--- up down (b) Calculate the magnetic force per unit le left right N/m into the page out of the page FB on 3 L (c) Will Wire #3 be attracted or repelled by the other two? n the new wire. attract repel up left out (a) Using the magnetometer, you determined that the magnetic field midway between Wires 2 and 3 was 2.9 μT, and that it pointed straight upwards. What then is the size and…arrow_forward10. A current of 10 A is flowing through an 1 m long wire. At a distance 0.2 mm from the wire, there is a +0.05 C charge, moving to the right with a speed of 250 m/s. What are the magnitude and direction of the force on the charge, caused by I? B X X X X X X I хх х х 100arrow_forwardThe current in a wire varies with time according to the relationship I = 55 A - (0.65 A/s2)t2. (a) How many coulombs of charge pass a cross section of the wire in the time interval between t = 0 and t = 8.0 s? (b) What constant current would transport the same charge in the same time interval?arrow_forward
- A stream of singly charged ions is ejected from the sun with a number density of 8.70 cm-3. The stream travels at a speed of 470.0 km/s until it strikes the circular face of a spacecraft which has a radius of 1.50 m. How much current flows onto the spacecraft?arrow_forwardA 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.)arrow_forwardCs2 - Mr.Khalil . ... The current in a wire varies with time according to the equation I(t) = 6.00 A + (4.80 A/s)t, wheretis in seconds. How many coulombs of charge pass a cross section of the wire in the time period between t = 0.00 s and t = 3.00 s? Select one: а. 39.6 С b. 13 С O c. 21 C O d. 72 C Clear my choice Next pag physiarrow_forward
- How would you do part A? This is a non graded worksheetarrow_forwardA portion of a metal wire is shown below. When connected to a battery, an electric field is set-up which causes electrons to slowly drift with velocities (va) usually on the order of 10 5~ 10-4 m/s. In the set-up below the drift velocity of the electrons is to the right, then the directions of the electric field E and the conventional current are to the respectively AZE right and right right and left O left and left O left and right O both unknownarrow_forward2) What is the drift speed of electrons in the 12-gauge wire of a certain conductor in a typical building of the UET physics lab having cross- sectional area of 3.31 um^2 and carries a uniform current of 10000.0 mA? Suppose each atom of the conductor contributes one free electron to the current, whereas the molar mass and density of the conductor is 63.5 g/mol and 8.92 g/cm^3.* Ob) 3 mf O c) 2.3 PF od) 2.1 m e) 2 UF f) 2 mF O F g) 1 m F O HINEarrow_forward