AIEEE 2005 | Magnetic Effect of Current Question 186 | Physics

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

Two concentric coils each of radius equal to $$2$$ $$\pi $$ $$cm$$ are placed at right angles to each other. $$3$$ ampere and $$4$$ ampere are the currents flowing in each coil respectively . The magnetic induction in Weber / $${m^2}$$ at the center of the coils will be
$$\left( {\mu = 4\pi \times {{10}^{ - 7}}Wb/A.m} \right)$$

$${10^{ - 5}}$$

$$12 \times {10^{ - 5}}$$

$$7 \times {10^{ - 5}}$$

$$5 \times {10^{ - 5}}$$

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

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