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Question: A stream of electrons is projected horizontally to the right. A straight conductor carrying a curren...

A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to the electron stream and above it. If the current in the conductor is from left to right, what will be the effect on the electron stream –

A

The electron stream will be pulled upwards

B

The electron stream will be pulled downward

C

The electron stream will be retarded

D

The electron stream will be speeded up towards the right

Answer

The electron stream will be pulled downward

Explanation

Solution

Magnetic field due to wire

in +y direction velocity of e in + i^\widehat{i}

\ force = q(v→×B→)=F→(\overset{\rightarrow}{v} \times \overset{\rightarrow}{B}) = \overset{\rightarrow}{F} in = – (i^×j^)=−k^(\widehat{i} \times \widehat{j}) = - \widehat{k}