AIEEE 2006 | Magnetic Effect of Current Question 206 | Physics

A long solenoid has $$200$$ turns per $$cm$$ and carries a current $$i.$$ The magnetic field at its center is $$6.28 \times {10^{ - 2}}\,\,\,Weber/{m^2}.$$ Another long solenoid has $$100$$ turns per $$cm$$ and it carries a current $${i \over 3}$$. The value of the magnetic field at its center is

$$1.05 \times {10^{ - 2}}\,\,Weber/{m^2}$$

$$1.05 \times {10^{ - 5}}\,\,Weber/{m^2}$$

$$1.05 \times {10^{ - 3}}\,\,Weber/{m^2}$$

$$1.05 \times {10^{ - 4}}\,\,Weber/{m^2}$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

Two thin, long, parallel wires, separated by a distance $$'d'$$ carry a current of $$'i'$$ $$A$$ in the same direction. They will

repel each other with a force of $${\mu _0}{i^2}/\left( {2\pi d} \right)$$

attract each other with a force of $${\mu _0}{i^2}/\left( {2\pi d} \right)$$

repel each other with a force $$_0{i^2}/\left( {2\pi {d^2}} \right)$$

attract each other with a force of $${\mu _0}{i^2}/\left( {2\pi {d^2}} \right)$$

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 2005

MCQ (Single Correct Answer)

-1

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

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