If a current-carrying wire is in a magnetic field, in what direction will a force be exerted on the wire?
a. perpendicular to the magnetic field and parallel to the current direction
b. parallel to both the current direction and the magnetic field
c. perpendicular to the current direction and parallel to the magnetic field
d. perpendicular to both the magnetic field and the current direction

Answer : Perpendicular to both the magnetic field and the current direction

Explanation :

If a current-carrying wire is in a magnetic field, the magnetic force exerted on the wire is given by :

.............(1)

Where

q is the electric charge

v is the velocity with which the particle is moving

B is the magnetic field

The direction of magnetic force is can be find by using right hand rule.

From equation (1), it is clear that the direction of force exerted on the wire is perpendicular to both the magnetic field and the direction of current.

Hence, the correct option is (d).

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.