Magnetic fields in current carrying conductor (straight wire)
IA
B
Magnetic fields in current carrying conductor(straight wire)
Class exercise(P.209#4(a)(i))
I
Magnetic fields in current carrying conductor(solenoid)
Solenoid 螺線管
A B
Class exercise(P.213#12)
Class exercise(P.212#10)
Class exercise(P.210#5)
Class exercise(P.210#6)
Class exercise(P.210#7)
In which direction does the coil rotate?
example
The coil rotates in the clockwise direction as seen by the observer.
What will you observe when switch S1 / S2 is closed?
Moving coil galvanometer
Circular magnet
Shunt (分流器 )
Shunt
Shunt (分流器 )
Shunt
I IG
IS
I = IG + IS
RG
RS
Shunt (分流器 )
Shunt
I IG
IS
RG
RS
IG RG = IS RS
Shunt (分流器 ) example
Shunt
5 A 1 mA
IS
100
RS
Step 2: Use IG RG = IS RS to find RS
Step 1: Find IS
Multiplier (倍加器 )
Multiplier
Multiplier (倍加器 )
Multiplier
V
IG
VG VM
RG
RM
Multiplier (倍加器 ) example
Multiplier
5 V
100 A
VG VM
1000
RM