In the arrangement shown in figure pulley is smooh and massless and string is light .Frication coeffcient between A and B is `mu` friction is absent between A and plane .Selcet the correct alternative(s) .
A. Acceleration of the system is zero if `muge(m_(B)-m_(A))/(2m_(B))tan thetaand m_(B)gtm_(A)`
B. Forcwe of friction between A and B is zero if `m_(A) = m_(B) `
C. b will cetainly move upwards if `m_(B)ltm_(A)`
D. Tension in the string is mg `(sintheta -mu costheta)` if `m_(A)= m_(B)=m`
