Exercises In Electrical And Magnetic Measurement With Answers

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...the deflections 280 20' and 210 respectively. If on another occasion a current of a certain strength produce a deflection of 370 in the galvanometer A, what deflection would the same current have produced in B? When a tangent galvanometer is inserted in a circuit with the plane of its coil coinciding with that of the magnetic meridian, a current of strength, c, will produce a deflection, 0, the two being connected by the equation c = m tan 0, where m is a constant whose numerical value depends upon the construction of the particular instrument and upon the intensity of the local magnetic field. Let mx and tn2 be the values of the constant m for the two galvanometers A and B; then from the first experiment we have nti tan 280 20' = m2 tan 210. i _ _tan 2i_ / ' m2 tan 280 20' ' ' ' V 7 Let x = the number of degrees of deflection of B when the second current is passing through it, then we shall have (23.) The current from a battery (A) when sent through a certain tangent galvanometer produces a deflection of 18 30', while the current from another battery (B) on being sent through the same galvanometer produces a deflection of 260. Compare the strengths of the two currents. Answer. As 69: 100, nearly. (24.) A tangent galvanometer of very small resistance was included in a circuit consisting of a series of 12 cells and a wire resistance of 1000 ohms and the deflection of the needle was 130. Had the cells been arranged in two parallel series of 6 each, what would have been the deflection of the needle? The resistance of each cell was 2 ohms, and its electromotive force 1 volt By Example 22 C = m tan 0 =--by Ohm's law. 2r But 2 E = 12 volts, and 2r = 12 x 2 + 1000 = 1,024 ohms; 6--130. Hence, for the value of m, to which the name reduction...

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