Question

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Physics experts' help needed ASAP! ❗❗

Question :- Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field? ✳️✳️

Please if possible provide a helpful diagram along with the answer, it will be truly helpful✔️✔️

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CLASS 10th SCIENCE

Answer 1

F vector = q times v vector cross B vector

Here q is negatively charged electron

v vector is in the direction South to North (for example)

But we know that electron got deflected to right side (ie East). So force vector F must be acting from West to East.

We need to check a few combinations of magnetic field B vector directions now (eg Floor to Cieling and Cieling to Floor). Only Cieling to Floor vector satisfies the equation - remember that electron is negatively charged.

So magnetic field is in the direction Cieling to Floor.

Answer 2

The direction of magnetic field is given by Fleming’s left hand rule. The direction of electric current will be from front wall to back wall as it is opposite to the direction of electron. Now since the direction of force is towards the right side. Hence by applying Fleming’s left hand rule, we can conclude that the magnetic field inside the chamber is in downward direction.