Answer:
There are two different types of current in widespread use today. They are direct current, abbreviated DC, and alternating current, abbreviated AC. In a direct current, the electrons flow in one direction.
Gravity will have a greater effect on an object with a heavier mass
Answer:
Velocity of Gulf Stream= 
west of north at a speed of 
Explanation:
Given
- speed of ship relative to Gulf stream=
west of north at a speed of 4 m/s
- speed of ship relative to earth=
west of north at a speed of 4 .8 m/s
Let 
be the velocity of the ship relative to the earth and 
be the velocity of the ship with respect to the Gulf stream
Let the west direction be negative x axis and north direction be positive x axis
Now
magnitude of the velocity is given by
Let the velocity of gulf stream makes an angle 
with the positive y axis we have
Velocity of Gulf Stream west of north at a speed of
Explanation:
When a charged particle describes a circular path in a uniform magnetic field, the charged particle experiences a magnetic force towards the center of circular path, according to Fleming's left hand rule. Therefore the magnetic force and velocity (tangent to circular path) are perpendicular to each other during the circular motion. As the direction of displacement, is the direction of velocity, hence force and displacement are perpendicular to each other.
Therefore work done by magnetic force,
W=Fscos90=0
