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BIOT SAVART LAW

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Class Activities: Biot Savart

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To find the magnetic field B at P due to a current-carrying wire we use the Biot- Savart law, 5.11 In the figure, with dl shown, what is ?

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In the figure, with dl shown, which purple vector best represents ? To find the magnetic field B at P due to a current-carrying wire we use the Biot- Savart law, E) None of these! 5.11

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What is the direction of the infinitesimal contribution dB(P) created by current in dl? To find the magnetic field B at P due to a current-carrying wire we use the Biot-Savart law, A)Up the page B)Directly away from dl (in the plane of the page) C)Into the page D)Out of the page E)Some other direction 5.12

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What is the magnitude of ? To find the magnetic field B due to a current-carrying wire, below, we use the Biot-Savart law, 5.13

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What is the magnitude of ? To find the magnetic field B due to a current-carrying wire, below, we use the Biot-Savart law, a) b) c) d) e) something else! (And, what's here, given that P = (x,y,z)?) 5.13

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What is the value of I ? To find the magnetic field B due to a current-carrying wire, below, we use the Biot-Savart law, 5.13m (What's here, given that P = (0,y,0)?)

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What is the value of I ? To find the magnetic field B due to a current-carrying wire, below, we use the Biot-Savart law, a) b) c) d) e) Other! 5.13m

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s What is B at the point shown? I I A) B) C) D) E) None of these (What direction does it point?) 5.14

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How about direction of dB(P) generated JUST by the segment of current dl in red? A) B(p) in plane of page, ditto for dB(P, by red) B) B(p) into page, dB(P, by red) into page C) B(p) into page, dB(P, by red) out of page D) B(p) complicated - has mult component (not or || to page), ditto for dB(P, by red) E) Something else!! 5.16 com What do you expect for direction of B(P)?

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I1I1 I2I2 I have two very long, parallel wires each carrying a current I 1 and I 2, respectively. In which direction is the force on the wire with the current I 2 ? (How would your answer change if you reverse the direction of both currents?) A) Up B) Down C) Right D) Left E) Into or out of the page

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What is the magnitude of ? To find the magnetic field B due to a current-carrying loop, we use the Biot-Savart law, A) B) C) D) E) Something quite different! 5.15 (Which colored arrow is ? r? r? )

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To find the magnetic field B due to a current-carrying loop, we use the Biot- Savart law, What is dB z (the contribution to the vertical component of B from this dl segment?) A) B) C) D) E) Something quite different! 5.15 b

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x y z K The B-field has A)y-component only B)z-component only C)y and z-components D)x, y, and z-components E) Other MD10-1 Consider the B-field a distance z from a current sheet in the z = 0 plane:

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x y z K The B-field has A)y-component only B)z-component only C)y and z-components D)x, y, and z-components MD10-1 Here is the integral expression for the B-field a distance z from a current sheet in the z = 0 plane:

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Physics 2102 Lecture 15 Biot-Savart Law Physics 2102 Jonathan Dowling Jean-Baptiste Biot (1774-1862) Felix Savart (1791–1841)

Physics 2102 Lecture 15 Biot-Savart Law Physics 2102 Jonathan Dowling Jean-Baptiste Biot (1774-1862) Felix Savart (1791–1841)

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