A rectangular frame of wire `abcd` has dimensions `1mxx 0.5m` and a total resistance of `30Omega` . It is pulled out of a magnetic field `B=2T` by applying a force of `1N` . It is found that the frame moves with constant speed.
(i) The constant speed is `30m//sec`
(ii) The emf induced in loop is `30` volt
(iii) The p.d. between `a` and `b` is `25V`
(iv) The p.d. between `c` and `d` is `5V` .