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The Right Hand Rule

The Right Hand Rule. How to find the direction of F, I or B. What is the right hand rule?. It’s a method of determining the direction of Force (F), Current (I) or Magnetic Field (B) There are actually 3 right hand rules that we will use. The 1 st Right Hand Rule. Only finds B. Given I.

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The Right Hand Rule

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  1. The Right Hand Rule How to find the direction of F, I or B

  2. What is the right hand rule? • It’s a method of determining the direction of Force (F), Current (I) or Magnetic Field (B) • There are actually 3 right hand rules that we will use.

  3. The 1st Right Hand Rule • Only finds B. Given I. • Grasp the wire with your right hand. • Your thumb is the current, your fingers are the magnetic field (B). • The field will either point clockwise or counter-clockwise.

  4. 1st RHR: Another Example • The current in the wire is going downward. • Which way does the magnetic field point? • Clockwise! Current (I)

  5. What if the wire is sideways? • The current in the wire is going to the right. • Which way does the magnetic field point? • It is coming out toward you! • But this is hard to show…. Current (I)

  6. If current, magnetic field or force is coming out of the paper we use a dot. If current, magnetic field or force is going into the paper, we use an X. out of the paper X means into the paper How do we show that?

  7. 2nd Right Hand Rule • Can be used to find out the direction of the magnetic field in an electromagnet. • Curl your fingers in the direction of the current. • Thumb =North Pole

  8. Curl your fingers in the direction of the current. Thumb =North Pole 2nd Right Hand Rule

  9. 2nd RHR Example • An electromagnet is wrapped around a nail. • Which end is the north end of the magnet? • The flat end or pointed end?

  10. Wrap your hand in the direction of the current. (remember it always leaves the positive end!) Your hand should curl so your fingers are out toward you. This means the north pole is the flat end! 2nd RHR Example Cont’d…

  11. Your thumb = current. Your fingers = magnetic field. Your palm = force. 3rd Right Hand Rule

  12. 3rd Right Hand Rule • If a wire travels through a magnetic field, it will experience a force. • You can figure out which way the force will push by using the 3rd Right Hand Rule.

  13. 3rd RHR: Example I S • Find the direction of the force on the wire. • Lay your hand flat, face down, due to the direction of I. • This means force is downward! N

  14. Right Hand Rule Homework • p. 664-666 • #44, 64-66 and 72. • Due Tomorrow!

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