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An electric field of magnetic  5000 \mathrm{v} / \mathrm{m} and a magnetic field of magnetic field of magnetic field of  0.01 \mathrm{~T} exists at right angles to each other in a region of space. with what speed must electrons be projected at right angles to both the fields so that they experience no net force?

Option: 1

5 \times 10^5 \mathrm{~ms}^{-1}


Option: 2

3 \times 10^6 \mathrm{~ms}^{-1}


Option: 3

5 \times 10^7 \mathrm{~ms}^{-1}


Option: 4

3 \times 10^8 \mathrm{~ms}^{-1}


Answers (1)

best_answer

The required speed is given by

\mathrm{v=\frac{E}{B}=\frac{5000}{0.01}=5 \times 10^5 \mathrm{~ms}^{-1} }
Hence the correct choice is (a).

Posted by

vishal kumar

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