Question

a particle of charge + 2C and ,mass 2kg is entering into a uniform magnetic field B = 3î + 4ĵ with a velocity v = -31+ 41. The direction of force acting on it is along​

Answer 1

Answer:

negative Z axis

Explanation:

• F = q ( v x B)
• F = 2 (-3i +4j) X ( 3i + 4j)
• F = 2 { -9 (ixi) -12 (ixj) +12(jxi) + 16 ( jxj)}
• F = 2 { -9(0) -12 k +12(-k) +16(0)}
• F= 2 {-24 k}
• F = - 48k
• therefore force is 48 units acting along negative z axis