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Two small objects each with a net charge of exert a force of magnitude on each other.

Two circles each labelled +Q. Left, F point left, right, F points right

We replace one of the objects with another whose net charge is :

Two circles, left labelled +Q, right labelled +4Q

Next, we move the and charges to be times as far apart as they were:

Two circles, left labelled +Q, on to far right labelled +4Q

Now what is the magnitude of the force on the ?

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Two small objects each with a net charge of exert a force of magnitude on each other.

Two circles each labelled +Q. Left, F point left, right, F points right

We replace one of the objects with another whose net charge is :

Two circles, left labelled +Q, right labelled +4Q

What is the magnitude of the force on the charge?

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Two small objects each with a net charge of exert a force of magnitude on each other.

Two circles each labelled +Q. Left, F point left, right, F points right

We replace one of the objects with another whose net charge is :

Two circles, left labelled +Q, right labelled +4Q

The original magnitude of the force on the charge was ; what is the magnitude of the force on the now?

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A very long straight wire carries a large steady current . Rectangular metal loops, in the same plane as the wire, move with velocity in the directions shown.

3x thin cylindars with an arrow pointing along its length, labelled i. I: v points perpendicular, II: v at 45deg III: v along

Which loop will have an induced current?

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The four separate figures below involve a cylindrical magnet and a tiny light bulb connected to the ends of a loop of copper wire. The plane of the wire loop is perpendicular to the reference axis. The states of motion of the magnet and of the loop of wire are indicated in the diagram. Speed will be represented by  and CCW represents counter clockwise.

In which of the following situations will the bulb light up? 

2x magnets with loop & bulb to their right on axis. I:mag move left, loop stationary II, mag stationary, loop collapsing loop

2x stationary magnets with loop & bulb to their right on axis. III:loop rotating CCW, IV: loop moving left towards the magent

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Two parallel wires I and II that are near each other carry currents and both in the same direction. Compare the forces that the two wires exert on each other.

I. A thin cylindar with an arrow pointing along its length, labelled i. II the same image labelled 3i

Which of the following is true:

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The magnetic field made by the bar magnet at one location is shown by the arrow on the diagram below:

A magnet: left is S, right is N. An arrow right of N points right. An x is directly below the midpooint of the magnet

At the point in space marked by the “x”. What is the direction of the magnetic field? 

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The magnetic field made by the bar magnet at one location is shown by the arrow on the diagram below:

A magnet: left is S, right is N. An arrow right of N points right. An x is directly to the left of S

At the point in space marked by the “x”. What is the direction of the magnetic field? 

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A proton is initially at rest in a region of constant magnetic field (shown below). There are no other charges present.

5 parallel arrows extend from left to right, labelled B. A proton is indicated in the centre of the centre arrow

Which of the following is correct?

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 A moving electron with charge  travels along the path shown and passes through a region of electric field. There are no other charges present. The electric field is zero everywhere except in the grey region.

An electron travels forward from y=0, then curves up to height y. A box overlays where the path begins to curve up.

Which of the following is correct? The direction of the electric field is: 

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