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NEETPhysicsMagnetic Effects of Current

The figure shows three situations when an electron with velocity ( v ) travels through a uniform magnetic field ( B ). In each case, what is the direction of magnetic force on the electron?

Options

  1. A+vez-axis, - vex-axis, + ve y-axis
  2. B-ve z-axis, - ve (x )-axis and zero
  3. C+ ve z-axis, + vey-axis and zero
  4. D- ve z-axis, + ve ( x )-axis and zero

Correct answer

B. -ve z-axis, - ve (x )-axis and zero

Step-by-step solution

According to Fleming's Right hand Rule In (1) force is in (-z ) axis In (2) force is in - (x )-axis In (3) force is zero because ( F = q ( v B )= qvB 180 ) i.e. (F=0 )

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