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Physics Chapter 12 : Topic 10
Forces Between Current-Carrying Conductors
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The force between two current-carrying conductors originates because:
Reasoning: A current produces a magnetic field around a conductor. This magnetic field exerts a force on moving charges in the nearby current-carrying conductor.
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When two parallel conductors carry currents in the same direction, the force between them is:
Reasoning: Each conductor lies in the magnetic field produced by the other. The magnetic force acts toward the other conductor, causing attraction.
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Two parallel wires carrying currents in opposite directions experience:
Reasoning: Opposite currents produce magnetic forces that push the conductors away from each other.
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A current-carrying wire produces a magnetic field because:
Reasoning: Magnetic fields are produced by moving electric charges. Current is the flow of charges, so it produces a magnetic field.
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The direction of magnetic field around a straight current-carrying conductor is determined by:
Reasoning: The right-hand grip rule gives the direction of magnetic field lines around a straight conductor.
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If the current in a straight conductor is reversed, the magnetic field around it:
Reasoning: Magnetic field direction depends on current direction. Reversing current reverses the magnetic field direction.
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Two parallel wires carry equal currents in the same direction. If the distance between them is increased, the force between them:
Reasoning: Force between parallel currents is inversely proportional to distance between conductors. $\Longrightarrow$ $\mathbf{F \propto}$ $\frac{\mathbf{1}}{\mathbf{d}}$
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The force per unit length between two long parallel current-carrying wires depends on:
Reasoning: The force per unit length is $\mathbf{F \propto}$ $\frac{\mathbf{1}}{\mathbf{d}}$. It depends on the product of currents and decreases with distance.
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Two parallel conductors carry currents $\mathbf{I}_{\mathbf{1}}\mathbf{\ }$and $\mathbf{I}_{\mathbf{2}}$. If $\mathbf{I}_{\mathbf{1}}$ is doubled, the force between them becomes:
Reasoning: Force is directly proportional to both currents. $\Longrightarrow$ $\mathbf{F \propto}\mathbf{I}_{\mathbf{1\ }}\mathbf{I}_{\mathbf{2}}$Doubling one current doubles the force.
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The magnetic force on a current-carrying conductor is maximum when the conductor is:
Reasoning: Magnetic force is $\mathbf{F = BIL}\mathbf{\ sin\ }\mathbf{\theta}$.Maximum value occurs when $\mathbf{\theta}\mathbf{=}\mathbf{90}^{\mathbf{o}}$.
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The force on a current-carrying conductor placed in a magnetic field is given by:
Reasoning: The magnetic force on a conductor carrying current is calculated using $\mathbf{F = BIL}\mathbf{\ sin\ }\mathbf{\theta}$.
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The direction of force on a current-carrying conductor in a magnetic field is found using:
Reasoning: Fleming’s left-hand rule gives the direction of force, magnetic field, and current relationship.
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Two parallel wires carry currents in opposite directions. The magnetic field produced by one wire at the position of the other wire is responsible for:
Reasoning: The magnetic field of one wire interacts with the current in the other wire, producing repulsion for opposite currents.
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If both currents in two parallel conductors are reversed simultaneously, the force between them:
Reasoning: Reversing both currents keeps their relative directions unchanged, so the force remains the same.
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A current-carrying conductor placed near another conductor experiences force because:
Reasoning: The magnetic field produced by one current interacts with the moving charges of the other conductor.
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The magnetic field around a long straight conductor carrying current is:
Reasoning: Magnetic field lines around a straight conductor form concentric circles.
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A current-carrying conductor placed in its own magnetic field experiences:
Reasoning: A conductor does not exert a magnetic force on itself due to its own magnetic field.
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Two parallel wires carrying currents in the same direction are equivalent to:
Reasoning: Same-direction currents create magnetic interaction that attracts the wires.
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The SI unit of force per unit length between two current-carrying conductors is:
Reasoning: Force per unit length has unit. $\Longrightarrow$ $\mathbf{N\ /\ m}$
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If the permeability of the surrounding medium increases, the force between two parallel currents:
Reasoning: Force depends on magnetic permeability. $\Longrightarrow$ $\mathbf{F \propto \mu}$Higher permeability produces a stronger magnetic interaction.
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Two long parallel conductors carry currents $\mathbf{(}\mathbf{I}\mathbf{)}$ and $\mathbf{(}\mathbf{3}\mathbf{I}\mathbf{)}$. The force oneach conductor will be:
Reasoning: According to Newton’s third law, forces between two interacting conductors are equal and opposite.
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A wire carrying current toward the north is placed in a magnetic field directed upward. The force direction can be found by:
Reasoning: Fleming’s left-hand rule determines force direction on a current-carrying conductor.
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If current in one conductor is increased while current in another remains constant, the force between them:
Reasoning: The force is directly proportional to the product of currents.
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The force between two parallel current-carrying conductors is an example of:
Reasoning: The force arises due to magnetic fields produced by moving charges.
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The reason two current-carrying wires can attract without being electrically charged is:
Reasoning: Magnetic interaction between currents causes attraction or repulsion independent of net charge.
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The force between two parallel conductors becomes zero if:
Reasoning: As distance increases greatly, the magnetic field of one conductor at the other approaches zero.
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The direction of force between two parallel conductors depends mainly on:
Reasoning: Same-direction currents attract, while opposite-direction currents repel.
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If one wire carries no current, the force on the other current-carrying wire due to it is:
Reasoning: Without current, the wire produces no magnetic field, so no magnetic force acts.
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The magnetic field produced by a current-carrying wire is stronger when:
Reasoning: Magnetic field strength around a conductor is directly proportional to current.
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The basic cause of force between current-carrying conductors is:
Reasoning: Current produces magnetic fields, and these fields exert forces on moving charges in nearby conductors.
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