Q6 / 16 · NTA Abhyas (NEET) 2020 · Physics · Mathematics in Physics

A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. Then the electron will be

  • A
    Be deflected to the left without increase in speed
  • B
    Be deflected to the right without increase in speed
  • Correct answer
    C
    Not be deflected but its speed will decrease
  • D
    Not be deflected but its speed will increase

Solution

As the electron is moving parallel to both the fields, so magnetic force does not affect the electron's motion. But electric force (qE) acts opposite to the motion of the electron. Hence, the electron will not be deflected but its speed will decrease.

Hence, the correct answer is option: 'C'.

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