Physics emf problem............?

Q.1 Two identical loops one of copper and the other of aluminium are rotated with the same angular speed in the same magnetic field.Compare :-

1. The induced emf

2. The current produced in the two coils.Justify your answer

Q.2 : Show that a potentiometer is an ideal voltmeter

Comments

  • Ok. For the first two parts; one of these metals is a better conductor and therefore will produce more effect from the magnetic field.

    Secondly: that almost sounded crazy to me, except that if you use a potentiometer to balance out the electrical effect then it can give a better reading (from Ohms Law) then many old-school meters. They used to have those as test equipment called a Bridge Circuit.

  • Q1

    1. The induced emf is the same

    2.The current produced is greater in the coil with smaller resistance (copper coil)

    Q2.

    Potentiometer IS NOT an ideal voltmeter. It is a RESISTOR.

    It can be used to make/build a voltmeter.

    The devil is in the details and physics is a VERY PRECISE science.

Sign In or Register to comment.