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 Two coaxial solenoids of different radii carry current I in the same direction. Let F1 be the magnetic force on the inner solenoid due to the outer one and F2 be the magnetic force on the outer solenoid due to the inner one. Then,   
  • a)
    F21 = F2=0
  • b)
    F1 is radially inwards and F2=0
  • c)
    F1 is radially inwards and F2 is radially outwards
  • d)
    F1 is radially outwards and F2=0
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Two coaxial solenoids of different radii carry current I in the same d...
**Answer:**

To determine the direction of the magnetic force between two coaxial solenoids carrying current, we can use the right-hand rule for the magnetic field.

1. **Right-hand rule for the magnetic field**: If you point your right thumb in the direction of the current flow in a wire, then the direction of the curled fingers will give you the direction of the magnetic field around the wire.

Now, let's analyze the situation:

1. The inner solenoid carries current I, which means that it produces a magnetic field around it.
2. The outer solenoid also carries current I, which means that it also produces a magnetic field around it.
3. Since the currents in the solenoids are in the same direction, the magnetic fields produced by each solenoid will also be in the same direction.
4. When two magnetic fields are in the same direction, the magnetic force between them is attractive.

Therefore, the correct answer is option 'A': F21 = F2 = 0. This means that there is no magnetic force acting on the inner solenoid due to the outer one, and there is no magnetic force acting on the outer solenoid due to the inner one.

This can be explained as follows:

1. The inner solenoid produces a magnetic field that acts radially outwards.
2. The outer solenoid produces a magnetic field that acts radially outwards as well.
3. Since the magnetic fields are in the same direction, they do not exert any force on each other.

Hence, option 'A' is the correct answer.
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Two coaxial solenoids of different radii carry current I in the same direction. Let F1be the magnetic force on the inner solenoid due to the outer one and F2be the magnetic force on the outer solenoid due to the inner one. Then, a)F21= F2=0b)F1is radially inwards and F2=0c)F1is radially inwards and F2is radially outwardsd)F1is radially outwards and F2=0Correct answer is option 'A'. Can you explain this answer?
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