What creates a magnetic field? More than one answer may be correct. ( )
A: a stationary object with electric charge
B: a charged capacitor disconnected from a battery and at rest
C: a stationary conductor carrying electric current
D: a difference in electric potential
A: a stationary object with electric charge
B: a charged capacitor disconnected from a battery and at rest
C: a stationary conductor carrying electric current
D: a difference in electric potential
举一反三
- 1. What creates a magnetic field? More than one answer may be correct. A: a stationary object with electric charge B: a stationary conductor carrying electric current C: a difference in electric potential D: a charged capacitor disconnected from a battery and at rest
- The Biot-Savart Law is used to（ ） A: determine the magnetic field created by an electric current B: determine the electric field created by an electric current C: determine the force field created by an electric current D: determine the magnetic field created by individual point charges E: determine the electric field created by individual point charges
- The<br/>Biot-Savart Law is used to A: determine<br/>the electric field created by individual point charges B: determine<br/>the electric field created by an electric current C: determine<br/>the magnetic field created by individual point charges D: determine<br/>the magnetic field created by an electric current E: determine<br/>the force field created by an electric current
- Both electric field E and electric potential V can describe the characteristics of a field. If the electric potential at a certain point is zero, the electric field at that point has to be zero.
- On the ideal conductor surface, the relationship between the electric field lines and the conductor surface is A: the electric field lines is always pertendicular to the conductor surface. B: the electric field lines is always parallel to the conductor surface. C: there is no electri field lines exsited. D: unable to determine the relationship.