Without a commutator, an electric motor would A) go too fast and burn out B) not

Question

Without a commutator, an electric motor would

A) go too fast and burn out
B) not move at all
C) not allow current to flow through it
D) stop after at most half a turn

**it's NOT C

2.

In the right hand rule for the B field at the center of a loop of current:

A) The middle finger points towards the B field, the index finger points towards the center of the loop, and the thumb point in the direction of the current.
B) The fingers curve in the direction of the current, the thumb is the direction of the B field.
C) The fingers curve in the direction of the B field, the thumb points in the direction of the current.
D) The middle finger points towards the center of the loop, the index finger points towards the B field, and the thumb point in the direction of the current.

Explanation / Answer

PART 1)

D) stop after at most half a turn

as commutator will change the direction of current to make it turn it is essential

PART 2)

B) The fingers curve in the direction of the current, the thumb is the direction of the B field.

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