mgsinα=ma①
The solution is a=gsinα.
(2) Let the magnetic induction intensity of the uniform magnetic field be B, then when the metal bar reaches the maximum speed,
The generated electromotive force E=BLvmcosα ②
Induced current generated in the loop? I=ER+r？ ③
Ampere force on metal bar F=BIL ④
When the resultant force on the cd rod is zero, the sliding speed reaches the maximum, then
Fcosα=mgsinα⑤
B = 1L2mg (R+R) 3VM is obtained from equation 234 15.
(3) Let the electric heat generated on the resistor R be Q and the electric heat generated by the whole circuit be Q, then
Mgssin α = 12 MVm2+Q Total ⑥
Q = RR+rq total ⑦
Q = Mr (GS？ vm2)2(R+r)。