Year 12s: what will be the first way you research your future options? >>

Physics( Circuits)

The question's snip is in the next post.

In the question's last part they said that that the 2 Ohm resistor is shorted out with a wire.
Please, can anyone tell me how could it be shorted out?
You can draw it on the picture if you prefer.

short wire.PNG8.4KB

Reply 2

RogerOxon

Original post by abdullahAK

In the question's last part they said that that the 2 Ohm resistor is shorted out with a wire.
Please, can anyone tell me how could it be shorted out?
You can draw it on the picture if you prefer.

By placing a wire in parallel with it.

Reply 3

uberteknik

Original post by abdullahAK

In the question's last part they said that that the 2 Ohm resistor is shorted out with a wire.
Please, can anyone tell me how could it be shorted out?
You can draw it on the picture if you prefer.

A way of doing this would be replacing the 2 ohms resistor with a straight line conductor in it's place.

Reply 4

abdullahAK

Have I drawn them correctly, is this the way to short out?

short wire drawing.PNG10.8KB

Reply 5

uberteknik

Original post by abdullahAK

Have I drawn them correctly, is this the way to short out?

1) Remove the blue and red wires completely.

2) Remove the 2 ohms resistor completely.

3) Only put the red wire in place of the now missing 2 ohms resistor.

Reply 6

abdullahAK

Thanks, mate, just one more question if you do not mind.
I can not understand how the current is being induced.
Can you please explain?
The copper rod is moving and the current is being induced in the rails, how?

(edited 4 years ago)

induction.PNG30.5KB

Reply 7

uberteknik

I"m assuming you are studying at A-level.

When a conductor moves through a magnetic field, the electrons (negative charge particles) in the conductor react with the field and move. A bulk movement of charge carrying particles is an electric current. The rod is the moving conductor which is where the current originates (induced). The rails are also conductors but are not moving so do not generate current of their own. Instead they create a circuit with the rod and ammeter to carry the current generated in the moving rod.

You need to learn Flemmings left and right hand rules where the relationship between the three components of magnetic field direction, conductor motion and induced current direction are all orthogonal to each other.