When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
a. 0.25
b. 0.50
c. 1
d. 2
e. 4
[Ques. 2] Oxygen is supplied to the atmosphere by
a. ozone.
b. incomplete combustion.
c. photosynthesis.
d. complete combustion.
[Ques. 3] Calculate the frequency, in hertz, of photons of light with energy of 2.00 10-19 J.
[Ques. 4] A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1 . The field at (0, 0, 1.0 m) is in the positive z direction. 2 . The field at (0, 1.0 m, 0) is in the negative y direction. 3 . The field at (1.0 m, 0, 0) is zero. 4 . The field at (0, 0, 1.0 m) is in the negative y direction.
a. 3 and 4
b. 1 and 3
c. 2 and 4
d. 1 and 2
e. None of these
[Ques. 5] Which of the following gases is a trace natural constituent of the air?
a. CO
b. SO2
c. CO2
d. NO2
[Ques. 6] Calculate the energy, in joules, of photons of light with frequency 6.00 1014 Hz.
[Ques. 7] A single circular (radius = R) loop of wire is located in the yz plane with its center at the origin. The loop has a clockwise current as seen from the point (+R, 0, 0). The direction of the magnetic field at the point
a. (0, 0, 0) is i and at the point (+R, 0, 0) is i.
b. (0, 0, 0) is i and at the point (0, +2R, 0) is i.
c. (0, 0, 0) is +i and at the point (+R, 0, 0) is +i.
d. (0, 0, 0) is +i and at the point (0, +2R, 0) is +i.
e. None of the above
[Ques. 8] Which of the following gases is a trace natural constituent of the air?
a. Ar
b. SO2
c. CO
d. NO2
[Ques. 9] When an electron is added to an atom, a(n) ______________ ion is formed.
Fill in the blank(s) with correct word
[Ques. 10] Two long parallel wires lie in the xz plane. One wire passes through the point (2 m, 0, 0) and the other through the point (+2 m, 0, 0). The wires carry equal currents in the positive z direction. 1 . The magnetic field at (3 m, 0, 0) is in the negative y direction. 2 . The magnetic field at (1 m, 0, 0) is in the positive y direction. 3 . The magnetic field at (+1 m, 0, 0) is in the positive y direction. 4 . The magnetic field at (+3 m, 0, 0) is in the negative y direction.
a. 1 and 2 are correct.
b. 1 and 4 are correct.
c. 2 and 3 are correct.
d. 3 and 4 are correct.
e. None of the above are correct.
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