# What is the equation for magnetic force?

Contents

## What is magnetic force Q?

If a charge q is moving with uniform velocity v parallel to the direction of a uniform magnetic field B, it experiences no force. … Your thumb points in the direction of the vector product v × B. If q is positive then this is the direction of F. If q is negative, your thumb points opposite to the direction of F.

## What is the rule for magnetic force?

The right hand rule states that: to determine the direction of the magnetic force on a positive moving charge, point your right thumb in the direction of the velocity (v), your index finger in the direction of the magnetic field (B), and your middle finger will point in the direction of the the resulting magnetic force …

## How do u calculate force?

The force formula is defined by Newton’s second law of motion: Force exerted by an object equals mass times acceleration of that object: F = m ⨉ a. To use this formula, you need to use SI units: Newtons for force, kilograms for mass, and meters per second squared for acceleration.

## How do you calculate the magnetic force of a wire?

The force on an individual charge moving at the drift velocity vd is given by F = qvdB sin θ. Taking B to be uniform over a length of wire l and zero elsewhere, the total magnetic force on the wire is then F = (qvdB sin θ)(N), where N is the number of charge carriers in the section of wire of length l.

THIS IS INTERESTING:  What happens if a magnet cracks?

## What variables does the magnetic force depend?

Background: A current-carrying wire in a magnetic field experiences a force that is usually referred to as a magnetic force. The magnitude and direction of this force depend on four variables: the current (I); the length of the wire ( L); the magnetic field ( B); and the angle between the field and the wire (θ).

## How do you calculate the magnetic force of a permanent magnet?

If you want to know the force on an electric charge then you must apply the Lorentz formula. It depends on the magnetic field generated by a permanent magnet: In uniform magnetic field the force acting on magnetic moment m is zero. However there is non-zero torque t: t=mxB (in vector notation).

## How do you find the force of a conductor?

Example

1. 5.0 cm = 5 ÷ 100 = 0.050 m.
2. force on a conductor carrying a current = magnetic flux density × current × length.
3. force = 0.60 × 0.75 × 0.050.
4. force = 0.0225 N.

## What is Maxwell’s third equation based on?

Maxwell’s 3rd equation is derived from Faraday’s laws of Electromagnetic Induction. It states that “Whenever there are n-turns of conducting coil in a closed path which is placed in a time-varying magnetic field, an alternating electromotive force gets induced in each and every coil.” This is given by Lenz’s law.