A homogeneous electric field E and a uniform magnetic field B are pointing in the same direction. A proton is projected with its velocity parallel to E. It will:
Correct answer: A. Go on moving in the same direction with increasing velocity
- A. Go on moving in the same direction with increasing velocity
- B. Go on moving in the same direction with constant velocity
- C. Turn to its right
- D. Turn to its left
Explanation
The proton will continue to move in the same direction as the initial velocity (parallel to the electric field), and its speed will increase over time. In other words, the proton will accelerate in the direction of the electric field.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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