AIEEE 2008 | Magnetic Effect of Current Question 177 | Physics

A horizontal overhead powerline is at height of $$4m$$ from the ground and carries a current of $$100A$$ from east to west. The magnetic field directly below it on the ground is
$$\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}\,\,Tm\,\,{A^{ - 1}}} \right)$$

$$2.5 \times {10^{ - 7}}\,T$$ southward

$$5 \times {10^{ - 6}}\,T$$ northward

$$5 \times {10^{ - 6}}\,T$$ southward

$$2.5 \times {10^{ - 7}}\,T$$ northward

AIEEE 2007

MCQ (Single Correct Answer)

-1

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

$$1/2$$

$$1/4$$

$$4$$

$$1$$

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