Qualification > Sciences
physics help !!
halosh92:
its D
because when u pass current through the iron core a magnetic field is induced at one end.a magnetic field is also induced at the other end..causing a voltage and thus higher or lower currnet *depends on the tansformer whether its a step down or step up transformer*
hope it helped ;D :D
astarmathsandphysics:
--- Quote from: esso on June 09, 2009, 07:47:52 am ---Thanks astar....
but why is 35 D ???????
need an answer please...
--- End quote ---
The motor stops because the voltage across it is zero.
esso:
yah understood .... Thanks everyone for the help ;)
nid404:
but astar how is the pd decreasing, cuz the current is increasing( resistance is reduced.) And when the current increases rotation in a motor is faster no?? Plz explain astar...i too am giving my exam tomorrow
QuickSilver:
Voltage Decreases because voltage is the pressure basically, so if there is less resistance then this means that ekectrons will produce a less effort to pass through decreasing the pressure, and since Voltage is INVERSLY proportional to current, then when voltage decreases this casuses the current to increase causing the motor to spin faster
Right Sir??
Thanks
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