Two solenoids of equal length are each made of 2000 turns of copper wire per meter. Solenoid I has a 5.00-cm radius; solenoid II a 10.0-cm radius. When equal currents are present in the two solenoids, the ratio of the magnitude of the magnetic field BI along the axis of solenoid I to the magnitude of the magnetic field BII along the axis of solenoid II, BI/BII, is
A. 1/4.
B. 1/2.
C. 1.
D. 2.
E. 4.
Answer: C
You might also like to view...
Answer the following statement(s) true (T) or false (F)
Suppose that a quanton’s energy is zero, irrespective of its spin orientation. Suppose further that we prepare this quanton in an arbitrary spin state 
. The probability of any possible experimental outcome for any spin observable will then be independent of time.
Why do astronomers suspect 'Oumuamua is not from our solar system?
A. It came from the direction of the constellation Lyra. B. Its composition is too different from the Sun's. C. Its shape is too elongated compared to asteroids in the solar system. D. It is moving too fast to be in orbit around the Sun.
The Sun's location in the Milky Way Galaxy is
A) very near the galactic center. B) in the halo of the galaxy, about 28,000 light-years above the galactic disk. C) at the very outer edge of the galactic disk. D) in the galactic disk, roughly halfway between the center and the outer edge of the disk.
At a depth of about 1030 m in the sea the pressure has increased by 100 atmospheres (to about 107 N/m2). By how much has 1.0 m3 of water been compressed by this pressure? The bulk modulus of water is 2.3 × 109 N/m2
A) 2.3 × 10-3 m3 B) 3.3 × 10-3 m3 C) 4.3 × 10-3 m3 D) 5.3 × 10-3 m3 E) 6.3 × 10-3 m3