Write down the expression for Lorentz force.

Write down the expression for the Lorentz force on a charged particle.

Write down the expression for the Lorentz force on a charged particle.

Write down the expression for the radii of orbits of hydrogen atom.Calculate the radius of the smallest orbit.

Write expression for power factor.

Write an expression for the centripetal force.

Write down an expression for the flux density B inside a long straight solenoid, explaining the symbols used.

Write the expression for the magnitude of force per unit length between two infinitely long parallel straight conductors.