An electromagnetic wave with a peak magnetic field component of 3.20 × 10^?7 T carries what average power per unit area? (?0 = 4? × 10^?7 T?m/A, ?0 = 8.85 × 10^?12 C2/N?m2 and c = 3.00 × 10^8 m/s)
a. 38.4 W/m2
b. 24.4 W/m2
c. 12.2 W/m2
d. 3.82 W/m2
e. 7.64 W/m2
c
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Two circular coils of diameter 30.0 cm are parallel to each other and have their centers along the same line L but separated by 22.0 cm. When an experimenter views the coils along L, the coil closer to her carries a clockwise current of 2.50 A
Find the magnitude and sense (clockwise or counterclockwise) of the current needed in the other coil so that the net magnetic field on L midway between the two coils will have a magnitude of 4.10 µT and point away from the experimenter who is viewing the coils along L. (?0 = 4? × 10-7 T ? m/A)
In the designation ? Canis Majoris, which part refers to the star and which part refers to the constellation?
a. ? refers to the constellation and Canis Majoris refers to the star. b. ? Canis Majoris refers to the star whereas Canis Majoris refes to the constellation. c. ? Canis refers to the star whereas Majoris refers to the constellation. d. None of the other choices are correct.
If the fifth order minimum in the diffraction pattern of a thin slit is at 40° from the central maximum, what is the highest order minimum in the pattern?
A) 6 B) 11 C) 8 D) 7 E) 9
A microscope has an objective lens with an aperture of diameter 0.60 cm where a monochromatic light source of wavelength 580 nm is used to illuminate the object. It is determined that the minimum angle of resolution is 1.18 × 10^-4 rad. If the illuminating source were replaced by a source of wavelength 700 nm, what would the minimum angle of resolution now become? (1 nm = 10-9 m)
a. 0.58 × 10^-4 rad c. 0.85 × 10^-4 rad b. 1.4 × 10^-4 rad d. 1.2 × 10^-4 rad