3 一质量M,半径为R的圆柱-|||-omega =dfrac (2{v)_(0)}(R)-|||-omega =dfrac (m{v)_(0)}((M+m)R)-|||-omega =dfrac (2m{v)_(0)}((M+m)R)-|||-omega =dfrac (m{v)_(0)}((dfrac {1)(2)M+m)R}

.=dfrac (1)(6)m(l)^2(omega )^2-|||-A B

[单选题]下图电路中，U=12V，R1=2Ω，R2=3Ω，R3=3Ω，R4=4Ω，求电流I是（）A。A .4B .2C .3D .1

[单选题]在下图电路中，U=12V，R1=2Ω，R2=3Ω，R3=3Ω，求此电路的总电流I是（）A。A .14B .42/3C .21/2D .4

[单选题]如图所示，已知E=110V，R0=1Ω，R=4Ω，则I为（）A。A . 110B . 27.5C . 22D . 11

=dfrac ({n)^2h}(8m/{s)^2}-|||-B omega =(x)=sqrt (dfrac {2)(t)}sin (dfrac ({n)^2p

[单选题]如图所示，GB=2V，R=9.8Ω，r=0.2Ω，开关接1时，电路中电流的大小为（）。A . 0AB . 10AC . 0.2AD . 约等于0.2A

[单选题]电路如图所示，已知E＝9V，R1＝1Ω，R2＝8Ω，R3＝5Ω，C＝12μF，则电容两端的电压Uc为（）V。A . 4B . 6.8C . 8D . 9

dfrac ({mu )_(0)I}(pi R)(dfrac (1)(2)+dfrac (pi )(6))-|||-dfrac ({mu )_(0)I}(pi

已知 omega gt dfrac (1)(4), 函数-|||-12. 已知 omega gt dfrac (1)(4), 函数-|||-(x)=sin (o

(B) .dfrac ({mu )_(0)I}(2pi R)+dfrac (3{mu )_(0)I}(8R)-|||-(c) dfrac ({mu )_(0)I