11.A square loop of side length 1 having n turns and carrying a current i is kept on a smooth horizontal surface. If a uniform magnetic field B exists in a direction parallel to an edge, then minimum value of B for which the coil will start tipping over will be: (Total mass of coil is M) Mgl (A) 2ni (B) Mg nil Mgi (C) 2nl Mg (D) 2nil 12. Three different processes that can occur in an ideal monoatomic gas are shown in the P vs P diagram. The path are labeled as A B, A C and A D. The heat gained by gas during these processes are given as QAB, QAC and QAD. Then which of the following options may be possible. (A) QAB < 0 (B) QAC T P B T T (C) QAD < 0 (D) QAB = 0 13.A physical quantity Z depends on four observables a, b, c and d as Z = amcp bnda (where m, n,p & q are positive values). The percentages of error in the measurement of a, b, c and d are 0.5%, 1.5%, 2.5% and 3.5% respectively. The percentage of error calculated in Z is 9%. Then the value of (m + 3n+5p+7q) is: (A) 9 (B) 12 (C) 15 (D) 18