- 1(current)
Q. No.A metal “Slinky” can be used as a solenoid. The “Slinky” is stretched slightly, and a current is passed through it. Will the resulting magnetic field cause the “Slinky” to collapse or to stretch out further?
| 1. | collapse |
| 2. | stretch out further |
| 3. | neither, the magnetic field is zero outside a solenoid |
| 4. | the answer depends on the direction of the current |
Subtopic: Force between Current Carrying Wires |
From NCERT
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Two long straight wires carrying currents \(i_1, i_2\) are placed as shown in the figure, just avoiding contact. The separation between the wires is negligible, and the wires are aligned along \(x\) & \(y\) axes respectively.
The wire along the \(x\text-\)axis experiences:
The wire along the \(x\text-\)axis experiences:
| 1. | a force along \(+y\) axis only. |
| 2. | a force along \(-y\) axis. |
| 3. | zero force, but a torque. |
| 4. | no force and no torque. |
Subtopic: Force between Current Carrying Wires |
From NCERT
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
A metal rod \(PQ\) (carrying current from \(P\) to \(Q\)) is placed perpendicular to an infinitely long wire carrying a current \(i_0.\) If this arrangement lies in a horizontal plane, in which direction will the rod \(PQ\) rotate?
1. clockwise
2. anticlockwise
3. along the axis of \(PQ\)
4. it will not rotate
Subtopic: Force between Current Carrying Wires |
From NCERT
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In an experimental setup, \(A\) consists of two parallel wires which carry currents in opposite directions as shown in the figure. A second set-up \(B\) is identical to set-up \(A\) except that there is a metal plate between the wires.
Let \(F_A\) and \(F_B\) be the magnitude of the force between the two wires in setup \(A\) and setup \(B\), respectively. Then:
1. \(F_A>F_B\ne0\)
2. \(F_A<F_B\)
3. \(F_A=F_B\ne0\)
4. \(F_A>F_B=0\)
Subtopic: Force between Current Carrying Wires |
From NCERT
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- 1(current)
Q. No.
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