AIEEE 2007 | Magnetic Effect of Current Question 219 | Physics

A charged particle with charge $$q$$ enters a region of constant, uniform and mutually orthogonal fields $$\overrightarrow E $$ and $$\overrightarrow B $$ with a velocity $$\overrightarrow v $$ perpendicular to both $$\overrightarrow E $$ and $$\overrightarrow B, $$ and comes out without any change in magnitude or direction of $$\overrightarrow v $$. Then

$$\overrightarrow v = \overrightarrow B \times \overrightarrow E /{E^2}$$

$$\overrightarrow v = \overrightarrow E \times \overrightarrow B /{B^2}$$

$$\overrightarrow v = \overrightarrow B \times \overrightarrow E /{B^2}$$

$$\overrightarrow v = \overrightarrow E \times \overrightarrow B /{E^2}$$

AIEEE 2007

MCQ (Single Correct Answer)

-1

A current $$I$$ flows along the length of an infinitely long, straight, thin walled pipe. Then

the magnetic field at all points inside the pipe is the same, but not zero

the magnetic field is zero only on the axis of the pipe

the magnetic field is different at different points inside the pipe

the magnetic field at any point inside the pipe is zero

AIEEE 2007

MCQ (Single Correct Answer)

-1

A long straight wire of radius $$a$$ carries a steady current $$i.$$ The current is uniformly distributed across its cross section. The ratio of the magnetic field at $$a/2$$ and $$2a$$ is

$$1/2$$

$$1/4$$

$$4$$

$$1$$

AIEEE 2007

MCQ (Single Correct Answer)

-1

A charged particle moves through a magnetic field perpendicular to its direction. Then

Kinetic energy changes but the momentum is constant

the momentum changes but the kinetic energy is constant

both momentum and kinetic energy of the particle are not constant

both momentum and kinetic energy of the particle are constant