20. Ir vectors and are 3-4+5 and 243-4k respectively find the unn vector parai (Si--A) 4) (S+1+) 3) 27 (S++4) 27 (5-+4) 1) 2) V27 EXERCISE-II Product of vectors 1r 7-ai+3 and i- then component of i perpendicular to vector B and in the plane in Dot Product 3) 2) 2. ir a--R and 24+ is perpendicular to then 2) B- 2R 3) B-R 4) B = A 1) A =R 1 Velocity and acceleration vectors of charged particle moving perpendicular to the direction of magna field at a given instant of time are -2i+ej and a-3i+4) respectively. Then the value of 2) 1.5 3) - 1.5 4) -3 1) 3 Cross Product 4, A force of F-i+7+k is acting at a point (-2, 3, 4) The moment of force ahout (1, 2, 3) is ) -j+sk 2) -j+k 3) 4j- 4k 4) -4k An insect of mass m=1 gm moves with a velocity v=i-2j+ km/s. Find its angular momentum about the origin O when the insect passes through the point P(-1,1,2)m. Use L=rxmv 1) (si+3j+ k10 2) (3) +k) 3) (si - 3) 4) null vector what will be the unit vector perpendicular to A 1) cosei + sin oj 2) - cosdi + sin 0j costi + sin ej 3) 4) sin Oi - cosBj 7. The adjacent sides of a parallekogram is represented by vectors 21+3j and i+4j. The area of D parallelogram is 1) 5 units 2) 3 units 3) 8 units 4) 11 units 8. Find the value of (a+b)x(-bi= 1) (ix6) 2) 2(4x6) 3) -2(a6) 4) -2(ax6) 9. A particle moves in the X- Y plane under the action of a force E soch that the value of ts momentun (P) at any time ', and its components are P,-2cost,P, -2sint. The angle Fand p at a given time ' will be I) e= 2) 0-30 3) 0=90 50 4) 8= 180