Electromagnetism

Question 1

Describe Fleming’s left hand rule

Answer 1

Thumb: Motion/Force going in direction of thumb

Index/First finger: Magnetic field going in direction of finger from N to S

Second/Middle finger: Current going in direction of finger from positive to negative

Thumb points up
Index points forward
Middle bends and points left

Question 2

Describe Fleming’s right hand rule

Answer 2

Thumb: Motion/Force going in direction of thumb

Index/First finger: Magnetic field going in direction of finger from N to S

Second/Middle finger: Current going in direction of finger from positive to negative

Thumb points up
Index points forward
Middle bends and points right

Question 3

Describe the difference between Fleming’s right and left hand rule

Answer 3

Left hand rule is used to determine the motor effect and to find direction of motion. Right hand rule is used to determine the AC generator and direction of current.

Question 4

What is the use of the slip rings in a motor?

Answer 4

To provide continuous electrical connection between external circuit and rotating coil without entangling wires during process

Question 5

What is the use of the slip rings in an AC generator?

Answer 5

To provide continuous electrical connection between rotating coil and external circuit without entangling wires during process