Question 13.1: At what distance from a long straight wire carrying a current of 10A is the magnetic field is equal to the earth’s magnetic field of 5 x 10^-5 T?

Question 13.2: A long solenoid having 1000 turns uniformly distributed over a length of 0.5m produces a magnetic fields of 2.5 x10^-3 T at the center. Find the current in the solenoid?

Question 13.3: A proton moving at right angles to a magnetic field of 01. T experiences a force of 2 x 10^-12 N. What is the speed of the proton?

Question 13.4: An 8 MeV proton enters perpendicularly into a uniform magnetic field of 2.5T. Find (a) the force on the electron (b) what will be the radius of the path of proton?

Question 13.5: A wire carrying current 10mA experience a face of 2N in a uniform magnetic field. What is the force on it when current rises to 39 mA?

Question 13.6: What is the time period of an electron projected into a uniform magnetic field of 10mT and moves in a circle of radius 6cm?

Question 13.7: A 0.2m wire is bent into a circular shape and is placed in uniform magnetic field of 2T. If the current in the wire is 20mA the find the maximum torque acting on the loop?

Question 13.8: The full scale deflection for a galvanometer is 10mA. Its resistance is 100ohms. How can it be converted into an ammeter of range 100A?

Question 13.9. How a 5mA, 100ohms galvanometer is converted into 20V Voltmeter?

Question 13.10. Two parallel wire 10cm apart carry currents in opposite directions of 8A. What is the magnetic field halfway between them?