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A uniform electric field and a uniform m...

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region with a velocity along the direction of fields, then

A

The electron will turn towards right

B

the speed of the electron will decrease

C

the speed of the electron will increase

D

the electron will turn towards left

Text Solution

Verified by Experts

Let v, E and B all act in the x-direction. Then the magnetic force will be zero. The electric force in the x-direction will be -eE, due to the -ve charge of the electron. So v will decrease.
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CHHAYA PUBLICATION-ELECTROMAGNETISM -EXERCISE
  1. A moving electron and a moving proton enter a uniform magnetic field i...

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  2. An alpha- particle and a proton having the same momentum enter a regio...

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  3. A uniform electric field and a uniform magnetic field are acting along...

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  4. A particle of charge q moves with a velocity vecv=ahati+bhatj in magne...

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  5. A proton, a deuteron and an alpha- particle are accelerated by the sam...

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  6. Through a straight conduction wire, current is flowing along positive ...

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  7. A conducting circular loop of radius r carries a constant current I. I...

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  8. A magnetic field is applied along positive z-axis. How should a plane ...

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  9. The path of a charged particle whose motion is perpendicular to a unif...

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  10. Two concentric coils each of radius 2pi cm are placed at right angles ...

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  11. For 1 A current, a galvanometer shows its full-scale deflection. If a ...

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  12. In an ammeter, 0.5% of main current passes through the galvanometer. I...

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  13. What is the nature of lines of force in a uniform magnetic field?

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  14. In a uniform magnetic field, lines of force are equispaced straight l...

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  15. How is the direction of a magnetic field vecB at a point related to th...

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  16. A manetic needle is kept below a very long conducting wire. If current...

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  17. A magnetic needle is placed below a very long conducting wire. If curr...

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  18. How does the magnetic field at a point near a long straight current-c...

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  19. When 1 A current flows through a circular conductor, the magnetic fiel...

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  20. Which physical quantity has the unit Wb.m^(-2)? Is it a scalar or a ve...

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