A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is
A)
3.8 × 10-5 T.
B)
3.8 × 10-7 T.
C)
1.2 × 10-5 T.
D)
1.2 × 10-7 T.
E)
3.8 × 10-8 T.
A
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Which of the following molecules is most likely to show a dipole-dipole interaction?
A) H2S B) CO2 C) CH4 D) H-CImageC-H E) none of the above
An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
A. There is no charge on either plate of the capacitor. B. The capacitor can be discharged by grounding any one of its two plates. C. Charge is distributed evenly over both the inner and outer surfaces of the plates. D. The magnitude of the electric field outside the space between the plates is approximately zero. E. The capacitance increases when the distance between the plates increases.
A parallel-plate capacitor has a capacitance of 10 mF and charged with a 20-V power supply
The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates. How much energy is now stored by the capacitor? A) 500 mJ B) 1200 mJ C) 125 mJ D) 62.5 mJ E) 250 mJ
Determine the equivalent capacitance of the combination shown when C = 45 ?F
a.
36 ?F
b.
32 ?F
c.
34 ?F
d.
30 ?F
e.
38 ?F