A galvanometer with a resistance of 40.0 ? deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?
A) 25 k?
B) 27 k?
C) 29 k?
D) 31 k?
E) 35 k?
Answer: A
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Each of two parallel wires separated by 8.0 mm carries a 20-A current. These two currents are oppositely directed. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.0 mT b. 1.6 mT c. 1.3 mT d. 1.8 mT e. 1.0 mT
The central star in a planetary nebula
a. is a main-sequence star. b. is a pre-main-sequence protostar. c. is a neutron star. d. will become a white dwarf.
A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
