![]() ![]() When a current flows through a solenoid, a magnetic field is generated along its axis due to the current flowing through circular loops. Using the right-hand grip rule, if the thumb represents the current flowing through a conductor, the fingers curl in the direction of the magnetic field.įigure: magnetic field due to current flowing through a wire The vector product or cross product of two vectors a ⃗ \vec a a and b ⃗ \vec b b is defined as,Ĭ ⃗ = a ⃗ × b ⃗ \vec c = \vec a \times \vec b c = a × bĬ ⃗ = a b sin θ n ^ \vec c = ab\sin \theta d l ), μ 0 \mu_0 μ 0 is the free space permeability and B ⃗ \vec B B is the magnetic field.ĭue to the cylindrical symmetry, when a constant current flows through a straight wire, the magnetic field lines curl about the wire on the surfaces of imaginary cylinders. An imaginary axis of rotation is gripped by four fingers, while the thumb points towards the axis itself. In physics, the normal direction can be thought of as the direction of torque due to rotation along the orientation of the curve. Rotation along a curve can have two orientations corresponding to the two opposite normal directions of a surface bounded by that curve. This is generally called the right-hand grip rule, also known as the right-hand screw rule. The thumb, index finger, and the middle finger are held perpendicularly to visualize three mutually perpendicular axes.Īnother form of the right-hand rule can be used to understand the sense of rotation. One example is the cross product of two normal vectors. In physics, right-hand rules can be employed to understand the direction of a vector perpendicular to a pair of vectors which are also normal to each other. Different left-hand and right-hand rules follow from these two orientations in many aspects of physics and mathematics. ![]() Attribute these letters F,B,I to the thumb, first finger and middle finger respectively.Three mutually perpendicular directions can have two possible orientations in three-dimensional space. Here, F for Force, B is the symbol of magnetic flux density and I is the symbol of Current. Relate the Fleming's left-hand rule with FBI (wait! NOT with the Federal Bureau of Investigation). The Center finger (middle finger) the direction of the Current.The Fore finger represents the direction of the magnetic Field.The Thumb represents the direction of Thrust on the conductor (force on the conductor).Relate the thumb with thrust, fore finger with field and center-finger with current as explained below. How to remember Fleming's left hand rule? Method 1: Fleming's left hand rule is applicable for motors. According to Fleming's left hand rule, if the thumb, fore-finger and middle finger of the left hand are stretched to be perpendicular to each other as shown in the illustration at left, and if the fore finger represents the direction of magnetic field, the middle finger represents the direction of current, then the thumb represents the direction of force. Whenever a current carrying conductor is placed in a magnetic field, the conductor experiences a force which is perpendicular to both the magnetic field and the direction of current.
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