A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
a. 0.40 mT
b. 0.80 mT
c. 0.10 mT
d. 0.20 mT
e. 0.75 mT
c
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A contact lens is made of plastic with an index of refraction of 1.50. The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What are the focal length and the power of the lens?
What will be an ideal response?
Which of the following quantities relating to motion is not a vector?
A. Acceleration B. Velocity C. Speed D. All of these choices are correct
Which one has larger kinetic energy: a 500-kg object moving at 40 m/s or a 1000-kg object moving at 20 m/s?
A) The 500-kg object B) The 1000-kg object C) Both have the same kinetic energy.
For the following reaction, identify whether the compound in bold is behaving as an acid or a base
H3PO4 + H2O ? H2PO4- + H3O+ A) acid B) base C) neither D) both E) none of the above