Magnetic fields in current carrying conductor (straight wire) I A B.

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)

Motor-rule

Motor-rule

+

Motor-rule

Class exercise(P.212#10)

Class exercise(P.210#5)

Class exercise(P.210#6)

Class exercise(P.210#7)

Motor

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

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

Multiplier

Application

Application

Application

I I

Miscellaneous