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Brums [2.3K]
3 years ago
6

An electron moving with a velocity = 5.0 × 10 7 m/s enters a region of space where perpendicular electric and a magnetic fields

are present. The electric field is = . What magnetic field will allow the electron to go through the region without being deflected?
Physics
1 answer:
inna [77]3 years ago
5 0

Answer:

The magnetic field is 2 \times 10^{-4} T

Explanation:

Given:

Velocity of electron v = 5 \times 10^{7} \frac{m}{s}

Electric field E = 10^{4} \frac{V}{m}

The force on electron in magnetic field is given by,

 F = qvB \sin \theta                      ......(1)

The force on electron in electric field is given by,

 F = qE                               ......(2)

Compare both equation,

   qE = qvB \sin \theta

Here \sin \theta = 1

  E = vB

  B= \frac{E}{v}

  B = \frac{10^{4} }{5 \times 10^{7} }

  B = 2 \times 10^{-4} T

Therefore, the magnetic field is 2 \times 10^{-4} T

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