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To calculate the force on a moving charge in a magnetic field, use the equation F = Bqv sinθ.

When a charged particle moves through a magnetic field, it experiences a force perpendicular to both its velocity and the magnetic field. This force is known as the Lorentz force and can be calculated using the equation F = Bqv sinθ, where F is the force, B is the magnetic field strength, q is the charge of the particle, v is the velocity of the particle, and θ is the angle between the velocity and magnetic field vectors.

The direction of the force can be determined using the right-hand rule. If the thumb of the right hand points in the direction of the velocity vector and the fingers point in the direction of the magnetic field vector, then the direction of the force is given by the direction in which the palm faces.

It is important to note that the force on a charged particle in a magnetic field does not change the particle's speed, only its direction of motion. This is because the force is always perpendicular to the velocity vector, and therefore does not contribute to any change in speed.

The Lorentz force is a fundamental concept in electromagnetism and has many practical applications, such as in particle accelerators and magnetic resonance imaging (MRI) machines.

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