Answer:
D. There is a magnetic force pushing the wires away from one another.
Explanation:
When electric current flows through one wire then it will induce magnetic field now this magnetic field will exert the force on another current carrying wire
Now we know that force between two current carrying wires is given as
so here if two wire have current in same direction then two wires will attract each other
Also when current in wire is anti parallel to each other then the force between two wires is repulsive force
so correct answer will be
D. There is a magnetic force pushing the wires away from one another.
Um student a because they were there a few seconds ahead
Answer:
Commutator is a ring which reverse the direction of current in AC circuit so that the coil connected to it will continuous to move in the same direction.
Explanation:
In motors there exist a coil which is rotated due to torque of magnetic field when current flow through it. Since AC current is used to run the motor so we know that AC current changes its direction after half cycle.
So here commutator plays an important role to reverse the direction of current after every half cycle so that the current goes in same direction always into the coil.
This will produce a constant direction torque on the coil so that it will rotate in same sense always.
So commutator role is to provide same direction current to the coil by reversing its direction after every half cycle
What condition alone is necessary so that the final kinetic energy of the system is zero after the collision?
<u>Option(a). </u>The objects must have initial momenta with the same magnitude but opposite directions.
What is a momentum?
- In Newtonian mechanics, linear momentum, translational momentum, or simply momentum is the product of the mass and velocity of an object.
- It is a vector quantity, possessing a magnitude and a direction.
- If m is an object's mass and v is its velocity (also a vector quantity), then the object's momentum p is :p=mv.
- In the International System of Units (SI), the unit of measurement of momentum is the kilogram metre per second (kg⋅m/s), which is equivalent to the newton-second.
To know more about momentum, refer:
brainly.com/question/1042017
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