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A negative test charge is moving near a long straight current carrying wire. A force will act on the test charge in a direction parallel to the direction of the current, if the motion of the charge is in a direction:
  • a)
    towards wire
  • b)
    the same as that of current
  • c)
    opposite to that of current 
  • d)
    perpendicular to both the direction of current and the direction towards wire.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A negative test charge is moving near a long straight current carrying...
The magnetic force shall act on the negatively charged test particle in direction parallel to current carrying wire, if the velocity  of the negative charge is as shown. 
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Most Upvoted Answer
A negative test charge is moving near a long straight current carrying...
Explanation:

When a negative test charge is moving near a long straight current-carrying wire, it experiences a force due to the magnetic field created by the current in the wire. The direction of this force can be determined using the right-hand rule.

Right-hand rule:
If the thumb of the right hand points in the direction of the current, then the curled fingers will indicate the direction of the magnetic field around the wire.

Force on a negative test charge:
According to the right-hand rule, if the motion of the negative test charge is in a direction towards the wire, the force acting on it will be parallel to the direction of the current.

Let's consider the different options mentioned in the question and analyze the direction of the force in each case:

a) Towards the wire:
If the motion of the test charge is towards the wire, the force acting on it will be parallel to the direction of the current. This is the correct answer.

b) The same as that of current:
If the motion of the test charge is in the same direction as the current, the force acting on it will be perpendicular to the direction of motion. This is not the correct answer.

c) Opposite to that of current:
If the motion of the test charge is opposite to the direction of the current, the force acting on it will be parallel to the direction of the current, but in the opposite direction. This is not the correct answer.

d) Perpendicular to both the direction of current and the direction towards the wire:
If the motion of the test charge is perpendicular to both the direction of the current and the direction towards the wire, the force acting on it will be zero. This is not the correct answer.

Therefore, the correct answer is option 'a' - the motion of the charge towards the wire.
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A negative test charge is moving near a long straight current carrying wire. A force will act on the test charge in a direction parallel to the direction of the current, if the motion of the charge is in a direction:a)towards wireb)the same as that of currentc)opposite to that of currentd)perpendicular to both the direction of current and the direction towards wire.Correct answer is option 'A'. Can you explain this answer?
Question Description
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