5. A search coil consisting of N turns of wire in a circle of radius r is used to measure small magnetic fields. It is to be designed so that flipping it 180 degrees in a field of B=2.0 Gauss causes a total charge of Q pass through a ballistic galvanometer. (a) Suppose that the coil has a resistance NRo where Ro is the resistance in one turn of wire. Using the fact that & = -do/dt, show that while the current in the coil depends on the speed with which it is rotated, the total charge Q passing through coil from start to finish does not. (b) If the resistivity of the wire is 8x10-7 Nm and the diameter of the wire is 100 um, what should be the radius r of the coil? (Neglect the resistance of the galvanometer.) 1x10- C to I Gaus. N turns Ballstic Galveremeten (measmee Q)

5. A search coil consisting of N turns of wire in a circle of radius r is used to measure small magnetic fields. It is to be designed so that flipping it 180 degrees in a field of B=2.0 Gauss causes a total charge of Q pass through a ballistic galvanometer. (a) Suppose that the coil has a resistance NRo where Ro is the resistance in one turn of wire. Using the fact that & = -do/dt, show that while the current in the coil depends on the speed with which it is rotated, the total charge Q passing through coil from start to finish does not. (b) If the resistivity of the wire is 8x10-7 Nm and the diameter of the wire is 100 um, what should be the radius r of the coil? (Neglect the resistance of the galvanometer.) 1x10- C to I Gaus. N turns Ballstic Galveremeten (measmee Q)

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

5. A search coil consisting of N turns of wire in a circle of radius r is used
to measure small magnetic fields. It is to be designed so that flipping it 180
degrees in a field of B=2.0 Gauss causes a total charge of Q = 1x10-7 C to
pass through a ballistic galvanometer. (a) Suppose that the coil has a resistance
N Ro where Ro is the resistance in one turn of wire. Using the fact that & =
-do/dt, show that while the current in the coil depends on the speed with which
it is rotated, the total charge Q passing through coil from start to finish does
not. (b) If the resistivity of the wire is 8x10-7 m and the diameter of the
wire is 100 um, what should be the radius r of the coil? (Neglect the resistance
of the galvanometer.)
I Gaus.
N turns
Ballstic Galvenometen (measunee Q)

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