Tag: magnetic force on a moving charge and current carrying wire

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Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

Fleming's left-hand rule is used to find the direction of _______ acting on the current carrying conductor placed in a/an ________ field.

  1. Force, Magnetic

  2. Force , Electric

  3. Torque, Magnetic

  4. Torque, Electric
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fleming's left-hand rule is a mnemonic used to determine the direction of the magnetic force acting on a current-carrying conductor placed within a magnetic field.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

At an instant a charge q moves with a velocity of 5 m/s along y-axis in a uniform magnetic filed $\underset{B}{\rightarrow}=(2\widehat{i}+3\widehat{j}+4\widehat{k})$

  1. The charge will experience a force in xy plane

  2. The charge will experience a force in yz plane

  3. The charge will experience a force in zx plane

  4. The charge will experience a force along x-axis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The force F = q(v x B). Given velocity v = 5j and B = 2i + 3j + 4k, the cross product v x B = 5j x (2i + 3j + 4k) = 10(j x i) + 15(j x j) + 20(j x k) = -10k + 0 + 20i. The resulting vector (20i - 10k) lies in the zx plane.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

A charge particle is moving in the direction of a magnetic filed.The magnetic force acting on the particle:

  1. is in the direction of its velocity

  2. is in the direction opposite to its velocity

  3. is perpendicular to its velocity

  4. is zero
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The magnetic force on a moving charge is F = q(v x B). If the charge moves parallel to the magnetic field, the angle between v and B is 0 degrees, so the cross product (and thus the force) is zero.