An electron experiences a force of (4.0 {i^{∧}+3.0 {j^{∧}) \times 10^{-13} {N} in a uniform magnetic field, when its velocity is 2.5 {k^{∧} \times 10^{7} {ms}^{-1}. When the velocity is redirected and becomes (1.5 {i^{∧}-2.0 {j^{∧}) \times 10^{7} {ms}^{-1}, then magnetic force on electron is zero. The magnetic field vector {B} is

Correct Answer is : 0.075∧i−0.1∧j

BSc Nursing GNM 2019 Solved Paper

Question : 39 of 200

Marks: +1, -0

An electron experiences a force of (4.0

∧

+3.0

∧

)×10−13N in a uniform magnetic field, when its velocity is 2.5

∧

×107ms−1. When the velocity is redirected and becomes (1.5

∧

−2.0

∧

)×107ms−1, then magnetic force on electron is zero. The magnetic field vector B is

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