Physics
Grade-10
Easy

Question

The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of the magnetic field is ___.

  1. 45o
  2. 60o
  3. 90o
  4. 180o

hintHint:

180°

The correct answer is: 180o


    A current carrying wire feels a force in the presence of an external magneticfield. It is found to be F = BILsinø, where,
    L is the length of the wire; I is the current; ø is the angle between the current deduction and the magnetic field.
    As the value of sin 180゚is 0, the force exerted on a current carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is 180゚.

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