Physics: Right Hand Rule

First Right Hand Rule (RHR 1)

Instructions

• first finding the direction of the magnetic field around a current carrying wire.

• Wrap your right hand around the wire so that your thumb points in the direction of the conventional current flow.

• Your fingers are pointing in the direction of the magnetic field

First Right Hand Rule

•Your thumb points in the direction of the current flow. •Your fingers point in the direction of the field lines around the current carrying wire.

Right Hand Rule #2

(RHR 2)

What does looping the wire create?

• Looping the wire over and over creates a magnetic field that reinforces itself, which creates an electromagnet. This magnet will have a north and south pole , just like a regular magnet.

Right Hand Rule #2 (RHR 2)

What does it determine?

• The second right hand rule helps us to determine which end of the electromagnet is North, or which direction the current is flowing in coiled wire.

Right Hand Rule #2 (RHR 2)

What does fingers and thumb represent?

• Fingers are direction of the current flow, from positive to negative as it coils around.

• Our thumb represents the direction in which the north pole is located.

Right Hand Rule #2 (RHR 2)

What will increase the strength of magnetic field?

Adding a magnetic material into the loops of wire increases the strength of the magnetic field, adding more coils, putting the coils closer together, and Increasing the current will all increase the magnetic field strength

Right Hand Rule #2 (RHR 2)

Remember to?

Do not confuse direction of current flow and North South pole. You must interpret the question to determine the correct answer.

Differences with RHR 1

• Thumbs is direction of current flow

• Fingers are fields lines

Used for a straight or single wire or talking about field lines

Differences with RHR 2

• Fingers are current flow

• Thumb is North pole of electromagnet

Used with a coiled or looped wire or talking about poles

Right Hand Rule #3

• Deals with a current carrying wire that is passing through a permanent magnetic field.

• Wire must run perpendicular to the magnetic field

• The wire must run perpendicular to the magnetic field

To sum up the RHR #3

• Thumb = Direction of current flow in wire.

• Fingers = direction of the magnetic field from North to South (no curling in this rule)

• Palm = facing in the direction of the force that is exerted on the wire (Slap)

What things do u consider in RHR?

• RHR #3 has three different items to consider!

• RHR #2 deals with N pole, so there are 2 possibilities

•RHR #1 is the other one