I've been thinking about Magnetic Fields, and I think that I've found a contradiction in conventional physics theory. While comparing the Left-Hand-Rule for Motors (LHR) and the Right-Hand-Rule for Generators (RHR), I found this contradiction: The Left-Hand-Rule states that if the Magnetic Field (B) is on the y-axis, and the Velocity of a Current (I) is on the x-axis; Then the Force acts in the z-axis up. This uses a negative charge (an electron). The Right-Hand-Rule states that if the Magnetic Field (B) is on the y-axis, and the Velocity of a Test Charge (v) is on the x-axis; Then the Force acts in the z-axis up. This uses a positive charge. https://www.physicsforums.com/attachment.php?attachmentid=68407&d=1396915312 Put another way, if both use a negative-charge as an example: The Left-Hand-Rule states the electron moving along the x-axis would have a Force-Up. The Right-Hand-Rule states the electron moving along the x-axis would have a Force-Down (Due to the negative-charge). https://www.physicsforums.com/attachment.php?attachmentid=68408&d=1396915312 Can anyone tell me why equal charges, with equal directions, would have opposite forces? Is one of my sources flawed? Is this simply due to fact that one rule is for motors and one for generators? Is there some context I haven't considered? Sources: Wikipedia - 'Fleming's left-hand rule for motors' Cutnell & Johnson – Physics – Sixth Edition – ISBN 0-471-15183-1 (page 624) Thank you for your advice, and I'll be glad if anyone can explain this.