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A particle of charge q moves with a velo...

A particle of charge q moves with a velocity `vecv=ahati+bhatj` in magnetic field `vecB=chati+dhatj`. The force acting on the particle has magnitude F. Them

A

F=0 if ad=bc

B

F=0 if ad =-bc

C

F=0 if ac=-bd

D

`Fprop(a^(2)+b^(2))^(1//2)xx(c^(2)+d^(2))^(1//2)`

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CHHAYA PUBLICATION-ELECTROMAGNETISM -EXERCISE
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  2. A uniform electric field and a uniform magnetic field are acting along...

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

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

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

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

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

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

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

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

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

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

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

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

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

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  20. What is the unit of magnetic permeability mu(0) of vacuum?

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