AIEEE 2005 | Magnetic Effect of Current Question 187 | Physics

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

its velocity will increase

Its velocity will decrease

it will turn towards left of a direction of motion

it will turn towards right of direction of motion

AIEEE 2005

MCQ (Single Correct Answer)

-1

A charged particle of mass $$m$$ and charge $$q$$ travels on a circular path of radius $$r$$ that is perpendicular to a magnetic field $$B.$$ The time taken by the particle to complete one revolution is

$${{2\pi {q^2}B} \over m}$$

$${{2\pi mq} \over B}$$

$${{2\pi m} \over {qB}}$$

$${{2\pi qB} \over m}$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

A current $$i$$ ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is

$${{{\mu _0}} \over {4\pi }},{{2i} \over r}$$ tesla

zero

infinite

$${{2i} \over r}$$ tesla

AIEEE 2004

MCQ (Single Correct Answer)

-1

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $$B.$$ It is then bent into a circular loop of $$n$$ turns. The magnetic field at the center of the coil will be

$$2n$$ $$B$$

$${n^2}\,B$$

$$nB$$

$$2{n^2}\,B$$

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