A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-T magnitude and is parallel to the current. What is the magnitude of the resultant magnetic field at a point that is 20 cm from the wire?
a. 70 T
b. 40 T
c. 10 T
d. 50 T
e. 36 T
[Ques. 2] An incredibly dense star so massive that light cannot escape from its surface is called a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 3] The concept of matter waves reflects the observation that particles such as electrons sometimes act like ______________.
Fill in the blank(s) with correct word
[Ques. 4] Two long parallel wires separated by 4.0 mm each carry a current of 24 A. These two currents are in the same direction. What is the magnitude of the magnetic field at a point that is between the two wires and 1.0 mm from one of the two wires?
a. 4.8 mT
b. 6.4 mT
c. 3.2 mT
d. 9.6 mT
e. 5.3 mT
[Ques. 5] The remaining core of a planetary nebula is called a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 6] Black light is a common name for the region of the EMR spectrum known as ______________.
Fill in the blank(s) with correct word
[Ques. 7] Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT
b. 10 mT
c. 8.0 mT
d. 1.6 mT
e. 7.2 mT
[Ques. 8] When the Sun moves off the main sequence, it will next become a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 9] Optical scanners at the grocery store often use He-Ne ______________.
Fill in the blank(s) with correct word
[Ques. 10] Each of two parallel wires separated by 6.0 mm carries a 40-A current. These two currents are in the same direction. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires.
a. 2.6 mT
b. zero
c. 1.9 mT
d. 1.6 mT
e. 3.2 mT
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