A long straight wire (diameter = 2.0 mm) carries a current of 30 A. What is the magnitude of the magnetic field 2.5 mm from the axis of the wire?
a. 3.2 mT
b. 2.8 mT
c. 2.4 mT
d. 3.6 mT
e. 3.0 mT
c
Physics & Space Science
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Resistance and Resistivity: The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material from which this wire is made?
A. 0.80 × 10-4 ? ? m B. 8.0 × 10-4 ? ? m C. 0.80 × 10-5 ? ? m D. 0.80 × 10-6 ? ? m E. 8.0 × 10-6 ?v
Physics & Space Science
The highest mountain of our Solar System exists on Earth.
Answer the following statement true (T) or false (F)
Physics & Space Science
The nucleus makes up about what percentage of the mass of an atom?
a. 99.9% b. 50% c. 90% d. 5%
Physics & Space Science
A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2 . What is the tension in the string?
a. 49 N b. 36 N c. 62 N d. 13 N e. 52 N
Physics & Space Science