The force on a current-carrying wire is minimum when the current is moving at what angle to the magnetic field?

10 degrees
30 degrees
45 degrees
90 degrees

Option A. 10 degrees

Explanation:

When a charged particle is placed magnetic field, it will possess magnetic force. The force acting on the particle is given by :

i and l are current and length of wire

Here,

is the angle between velocity and magnetic field.

The force is minimum when the value of is minimum.

It is clear that the value of sin(10) is minimum out of all other angles. So, the force on a current-carrying wire is minimum when the current is moving at what angle of 10 degrees to the magnetic field

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.