A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?
A. 3.0 mT
B. 12 mT
C. 5.3 mT
D. 7.4 mT
E. 8.0 mT
Answer: C
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A dentist uses a concave mirror (focal length 2 cm) to examine some teeth. If the distance from the object to the mirror is 1 cm, what is the magnification of the tooth?
a. 6 b. 1 c. 4 d. 2 e. 1.5
What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of –16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C
If it is given that 546 K equals 273°C, then it follows that 423 K equals:
a. 127°C. c. 473°C. b. 150°C. d. 1200°C.