A 2.0-cm length of wire centered on the origin carries a 20-A current directed in the positive y direction. Determine the magnetic field at the point x = 5.0 m on the x-axis.
a. 1.6 nT in the negative z direction
b. 1.6 nT in the positive z direction
c. 2.4 nT in the negative z direction
d. 2.4 nT in the negative z direction
e. None of the above
[Ques. 2] The Greek astronomer who assigned the stars to six magnitudes was named ______________.
Fill in the blank(s) with correct word
[Ques. 3] When the energy state of an atom changes by E, the frequency of the photon emitted or absorbed is calculated by dividing E by ______________.
Fill in the blank(s) with correct word
[Ques. 4] Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
a. 72 T
b. 48 T
c. 24 T
d. 96 T
e. 32 T
[Ques. 5] On the H-R diagram, the Sun lies on the ______________.
Fill in the blank(s) with correct word
[Ques. 6] Niels Bohr postulated that the hydrogen electron radiates energy only when it makes a(n) ______________ from one allowed orbit to another.
Fill in the blank(s) with correct word
[Ques. 7] One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 T
b. 5.0 T
c. 3.0 T
d. 7.0 T
e. 1.0 T
[Ques. 8] The stars of highest photospheric temperature are those of spectral class ______________.
Fill in the blank(s) with correct word
[Ques. 9] Niels Bohr reasoned that a discrete line spectrum must be the result of a(n) ______________ effect.
Fill in the blank(s) with correct word
[Ques. 10] A car with a radio antenna 1.0 m long travels at 80 km/h in a locality where the Earth's magnetic field is 5.0 105 T. What is the maximum possible emf induced in the antenna as a result of moving through the Earth's magnetic field?
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