1. Write down the formula for the force that acts on a charged particle moving in a magnetic field. Explain the meaning of each term in the formula with the aid of a suitable diagram and indicate clearly any vector quantities that are involved. (2 marks) (b) An alpha particle is accelerated from rest through a potential difference of 2531 volts. It then enters a uniform magnetic field of strength 0.2 T in a plane perpendicular to the magnetic field. Calculate the radius of its path in the magnetic field. (3 marks) (a) (c) Write down the equation for the Biot-Savart law. Explain the meaning of each term in the equation by drawing and making reference to a suitable diagram. Indicate clearly the direction of any vector quantities involved. (2 marks)