A small compass is placed near a current-carrying wire. The wire is vertical, and the compass is on a horizontal surface. The re
d end of the compass needle would point to geographic north if it weren’t near the wire. What direction is the current flowing in the wire, up or down? Explain your reasoning
1 answer:
Answer:
The direction of magnetic field produced by a current carrying wire is given by the right hand thumb rule. If the thumb points in the direction of current the fingers curl along the direction of magnetic field.
further, The red end of the compass needle points in the direction of external magnetic field. As the red end of the needle is pointing away from us, the external magnetic field at its location should also be directed away from us. Using the right hand thumb rule, we can see that this is only possible if the current in the wire is flowing upwards.
Explanation:
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Answer:
a
The speed is
b
The distance is
Explanation:
From the question we are told that
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The distance from my location is
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The speed of the ice cream is
substituting values
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So
substituting values
Answer:
Explanation:
According to the Coulomb's law, the magnitude of the electrostatic force between two static point charges and
, separated by a distance
, is given by
where k is the Coulomb's constant.
Initially,
The negative sign is taken with force F because the force is attractive.
Therefore, the initial electrostatic force between the charges is given by
Now, the objects are then brought into contact, so the net charge is shared equally, and then they are returned to their initial positions.
The force is now repulsive, therefore,
The new charges on the two objects are
The new force is given by
Using (1),
Using (1),
When ,
When ,
Since,
Therefore,