12 Magnetism and the motor effect

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Question 1

A d.c. motor turns the paddle in a laboratory stirrer. A sensor records 72 reversals of the current in the motor coil during 3.0 s. The split-ring commutator reverses the current every half-turn.

How many revolutions per minute is the motor turning?

[1]

$revolutions/min24\ \text{revolutions/min}$

$revolutions/min1440\ \text{revolutions/min}$

$revolutions/min720\ \text{revolutions/min}$

$revolutions/min36\ \text{revolutions/min}$

12 Magnetism and the motor effect

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

Question 1

A d.c. motor turns the paddle in a laboratory stirrer. A sensor records 72 reversals of the current in the motor coil during 3.0 s. The split-ring commutator reverses the current every half-turn.

How many revolutions per minute is the motor turning?

[1]

$revolutions/min24\ \text{revolutions/min}$

$revolutions/min1440\ \text{revolutions/min}$

$revolutions/min720\ \text{revolutions/min}$

$revolutions/min36\ \text{revolutions/min}$

12 Magnetism and the motor effect

Question 1

Markscheme

12 Magnetism and the motor effect

Question 1

Markscheme

12 Magnetism and the motor effect

Question 1

12 Magnetism and the motor effect Questions

12 Magnetism and the motor effect

Question 1

12 Magnetism and the motor effect Questions