A and B are two conductors carrying a current i in the same direction. x and y are two electron beams moving in the same direction. There will be
A
repulsion between A and B, attraction between x and y.
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B
attraction between A and B, repulsion between x and y.
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C
repulsion between A and B and between x and y.
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D
attraction between A and B and between x and y.
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Solution
The correct option is B attraction between A and B, repulsion between x and y. The force between two parallel current carrying conductors is given as, F=μ04πI1I2la
The direction of magnetic force is indicated in the figure and is found using the right-hand thumb rule. Since, the direction of current is same , they attract each other.
x and y are e− beams, though there will be attractive magnetic force between them as e− beams will also behave as current carrying wires but electric force between them is repulsive as same charges (electric) repel each other.