MHT CET202013 Oct 2020Evening ShiftPhysicsMagnetic Effects of CurrentActual
A wire carrying current 'I' along x axis has length ' ' and it is kept in a magnetic field B =( +2 -3 k ) B W b m² . The magnitude of magnetic force acting on the wire is
Options
- A15 I B
- B11 I B
- C13 I B
- D19 I B
Correct answer
C. 13 I B
Step-by-step solution
aligned F &= I B F &= I i ( i +2 j -3 k ) B &= I B ( i i + i 2 j -3 i k )= I B (0+2 k +3 j ) &=(2 k +3 j ) I B aligned Magnitude of (2 k +3 j )= 4+9 = 13 F = 13 I B