Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Ivo:
--- Quote from: Dana on May 26, 2010, 10:51:37 am ---What abt this one ::) I really don't get it? ???
Four metal rods are placed, in turn, inside a coil of copper wire.
Which rod would be the most suitable to use for the core of a coil in a circuit breaker?
number of paper clips picked up when there is a current in the coil: number of paper clips still attracted when the current is switched off:
A 1 0
B 20 2
C 35 0
D 35 30
--- End quote ---
C, right. Cos you want a electromagnet which magnetisises and demagnetises easily. Electromagnets lose magentism when current is siwtiched off, that's why it's zero when off.
6394:
@ kimo jesus n dana wen r u ppl gettin ovr wid phy ppr 1
because m done ??!11??!!
dodi23:
soo how wz it??
Ghost Of Highbury:
--- Quote from: Kimo Jesus on May 26, 2010, 10:51:28 am ---aadi for u
a women tune her radio to a station broadcasting on 200m
what does 200m tell her about the radio wave?
freq
wave leng
sped
ampl
--- End quote ---
if m is meter, shud be wavelength. although, the wavelength of medium wave radio is 100 m...anyway...
Dana:
--- Quote from: Ivo on May 26, 2010, 10:52:55 am ---C, right. Cos you want a electromagnet which magnetisises and demagnetises easily. Electromagnets lose magentism when current is siwtiched off, that's why it's zero when off.
--- End quote ---
That's what I was thinking.. I'll check and tell you. Thanks alot!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version