Given that the magnetic circuit of AC electromagnet. The voltage U is constant . How will the Magnetic flux [img=13x19]1803a2fa8f20802.png[/img] change when the air gap length increases ( ).[img=455x406]1803a2fa9d5f73f.jpg[/img]
A: increase
B: decrease
C: remain unchanged
D: not sure
A: increase
B: decrease
C: remain unchanged
D: not sure
举一反三
- Given that the magnetic circuit of DC electromagnet. The voltage U is constant . How will the Magnetic flux [img=13x19]1803a2fab6cb10e.png[/img] change when the air gap length increases ( ).[img=455x406]1803a2fac3677ca.jpg[/img] A: increase B: decrease C: remain unchanged D: not sure
- For a magne2c circuit with air gap, if the magneto-mo2ve force remains unchanged and the air gap length is increased (Rm increases), the magne2c flux in the air gap will ( ). A: not sure B: decrease C: increase D: remain the same
- What is the meaning of[img=31x25]17de809ba6b2a44.jpg[/img]?[img=362x202]17de809bb25fc43.jpg[/img] A: Permeability of the air gap B: Reluctance of the air gap C: Length of the air gap D: Length of the magnetic circuit
- 函数f(x)=[img=15x18]17e0a6f63edb84a.jpg[/img]-5x-4, 则f′(x)=, f′(2)=.
- 在如图所示的匀强磁场中，已经标出了电流I和磁场B以及磁场对电流作用力F三者的方向，其中错误的是（ ）In the uniform magnetic field as shown in the figure, the directions of current I and magnetic flux density B and the magnetic force on current F have been marked, and the wrong one is ( ) A: [img=77x76]18035646b26abf1.png[/img] B: [img=72x74]18035646bd9ced2.png[/img] C: [img=97x71]18035646c9326e7.png[/img] D: [img=71x80]18035646d3b6dd2.png[/img]