- #1
kissatlips
- 1
- 0
Homework Statement
Suppose you drop an aluminum rod of length 1.0 m out of a window at a
equator, where the magnetic field of the Earth is 2.0x10-5 T. The rod stays oriented
horizontally as it falls.
Homework Equations
What is the induced EMF between the ends of the rod after 5
seconds?
The Attempt at a Solution
NO idea !
help please
----------------------------------------------------------------------------
Homework Statement
A rectangular coil of 150 loops forming a closed circuit measures 0.2 m x 0.1
m. The resistance of the coil is 5 Ohm. The coil is placed between the poles of an
electromagnet, face on to the magnetic field. Suppose that when we switch the
electromagnet off, the magnitude of magnetic field decreases at the rate of 20 T/s.
Homework Equations
What is the induced EMF in the coil? What is the magnitude and direction of the induced
current?
The Attempt at a Solution
NO idea !
help please
------------------------------------------------------------------------------
Homework Statement
The windings of a large electromagnet have an inductance of 10.0 H and a
resistance of 8.00 Ohm. The electromagnet is connected to the external EMF of 230 V.
Homework Equations
After electromagnet is switched on, how long does it take for the current to build up to
50% of its final value? What is the final, steady value of the current that is attained after
fairly long time?
The Attempt at a Solution
NO idea !
help please