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So when I use the right hand slap rule, I just use it as normal, putting my hand into position as per whatever diagram is given correct? Ok. Then when I'm using the right hand GRIP rule do I always do everything as per the diagram THEN I REVERSE THE THE DIRECTION OF WHATEVER RESULT I GOT (because of Lenz's law. Correct?).?

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3 Answers

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"You reverse the direction of the current given to you by the rule to find the direction the electrons are going, because electrons always go the opposite way to the current." This is my friends answer to you.

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Grip rule can be confusing as it can be applied in 3 situations;


To determine the field direction around a current carrying wire
To determine the field direction for a current carrying solenoid (coil)
To determine the direction of the induced field created by a coil when its experiences a changing magnetic field (change in flux with time)


Lenz's Law only applies to the third situation. In this case the induced current (induced by the the applied field) flows in such a way that the field it creates (induced field) opposes the applied one.
HTH

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To illustrate Mr Robinson's concept:



To use the right hand rule for Lenz's Law, your fingers will be the direction magnetic field (or flux) and your thumb will be the direction of current.

First put your fingers through the loop, upwards as shown in the diagram. This should signify an increasing magnetic field upwards through the loop. Now grip one side of the loop. Which way is your thumb pointing? It should point to your right, or if you like, anticlockwise around the loop. So the applied current is anticlockwise.

According to Lenz's Law, the increasing flux upwards through the loop as shown by your fingers should be opposed. Now put your fingers through the loop downwards. This should signify an opposed magnetic field since it is now in the opposite direction. Lets call this the induced magnetic field. Grip the edge of the loop again and where is the induced current flowing? Your thumb should point left, or clockwise, so the induced current flows clockwise.

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