Two thin long parallel wires, separated by a distance $d$ carry a current of $I$ $amp$ in the same direction. They will
Two thin long parallel wires, separated by a distance $d$ carry a current of $I$ $amp$ in the same direction. They will
- A
attract each other with a force of $\mu_0I^2/2 \pi d^2$ per unit length.
- B
repel each other with a force of $\mu_0I^2/2 \pi d^2$ per unit length.
- C
attract each other with a force of $\mu_0I^2/2 \pi d$ per unit length.
- D
repel each other with a force of $\mu_0I^2/2 \pi d$ per unit length.
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- [JEE MAIN 2024]
Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are $3 : 4 : 5$. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero
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A straight horizontal conducting rod of length $0.45\; m$ and mass $60\; g$ is suspended by two vertical wires at its ends. A current of $5.0 \;A$ is set up in the rod through the wires.
$(a)$ What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero?
$(b)$ What will be the total tension in the wires if the direction of current is reversed keeping the magnetic field same as before? (Ignore the mass of the wires.) $g = 9.8\; m s^{-2}.$
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$(a)$ What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero?
$(b)$ What will be the total tension in the wires if the direction of current is reversed keeping the magnetic field same as before? (Ignore the mass of the wires.) $g = 9.8\; m s^{-2}.$
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