A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. A current I = 0.1 A is sent through the wire. What is the the magnetic field on the axis of the solenoid?
A)
6.6 × 10-5 T
B)
2.5 × 10-5 T
C)
1.3 × 10-5 T
D)
3.6 × 10-5 T
E)
9.8 × 10-5 T
B
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What will be an ideal response?
Two point charges are placed along a horizontal axis with the following values and positions: +3.8 µC at x = 0 cm and ?7.6 µC at x = 20 cm. At what point along the x axis is the electric field zero?
a. 10 cm b. 8 cm c. –5 cm d. –48 cm e. –68 cm
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
a. 8 × 10^?5 W/m2 b. 8 × 10^?6 W/m2 c. 3 × 10^?3 W/m2 d. 0.8 W/m2 e. 2.5 × 10^?5 W/m2
What happens when the index of refraction is equal to 1?
a. No refraction occurs. b. Light cannot pass into the material. c. An average amount of refraction takes place. d. The maximum possible refraction occurs. e. The index of refraction cannot be calculated for this material.