A wire of diameter d = 1 mm is wrapped around a cylindrical core of radius R = 5 cm and length l = 30 cm to build a solenoid. What is the energy stored in this solenoid when a current I = 0.2 A passes through it?
A)
1.2 × 10-4 J
B)
9.6 × 10-4 J
C)
4.8 × 10-4 J
D)
2.4 × 10-4 J
E)
0.6 × 10-4 J
E
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A charge of +80 ?C is placed on the x axis at x = 0 . A second charge of ?50 ?C is placed on the x axis at x = 50 cm. What is the magnitude of the electrostatic force on a third charge of 4.0 ?C placed on the x axis at x = 30 cm?
a. 13 N b. 77 N c. 39 N d. 25 N e. 45 N
The densest stars in the H-R diagram are the white dwarfs
a. True b. False Indicate whether the statement is true or false
Why do jovian planets with highly eccentric orbits indicate that it is unlikely that a star has a habitable terrestrial planet?
What will be an ideal response?
An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
A) -0.10 B) 0.10 C) 0.15 D) 0.20 E) -0.20