A particle is injected perpendicularly into an electric field…
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A particle is injected perpendicularly into an electric field. It travels along a curved path as depicted in the figure 3. The particle is
A. gamma ray
B. a proton
C. a neutron
D. an electron
QUICK ANSWER…
D
DETAILS…
First of all, the particle must be charged since it got deflected, now the next challenge will be to identify if it is negatively or positively charged.
We know that the lines of electric fields move from positive terminal to negative terminal, this implies that the top terminal in the diagram is negatively charged while the down is positively charged. Now, the particle deflected down towards the positive terminal must be negatively charged, as like charges repel and unlike charges attract.
An electron has been identified as the deflected particle.
Now for the right answer to the above question:
- Option A is incorrect. gamma ray is neutral and so, cannot be deflected by an electric field.
- Option B is incorrect. a proton is positively charged and expected to be deflected towards the negative terminal which is at the top and not down.
- C is incorrect. a neutron will not be deflected because it is neutral.
- D is the correct answer. an electron is negatively charged, and so, expected to be attracted towards the positive terminal which is downwards.
KEY-POINTS…
You may please note these/this:
- The direction of the lines of electric field is usually from positive terminal to negative terminal.
- Hence, the particle is attracted towards the positive side.
- This implies that the particle is negatively charged.
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/ culled from 2015 JAMB-UTME physics past question 12 /
