When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
A: 0.25
B: 0.50
C: 1
D: 2
E: 4
A: 0.25
B: 0.50
C: 1
D: 2
E: 4
举一反三
- 1) What happens to the magnitude of the magnetic field inside a long solenoid if the current is doubled? A: It becomes four times larger. B: It becomes twice as large. C: It is unchanged. D: It becomes one-half as large. E: It becomes one-fourth as large.
- When the medium is magnetized, the molecular magnetic moment inside the paramagnetic material turns to the opposite direction of the external magnetic field
- When the medium is magnetized, the molecular magnetic moment inside the paramagnetic material turns to the opposite direction of the external magnetic field A: 正确 B: 错误
- There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。
- There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。 A: 正确 B: 错误