44509 dit content rid 44610018 1/courses/PHYS2360007201730/motorActivity pdf PHY

Question

44509 dit content rid 44610018 1/courses/PHYS2360007201730/motorActivity pdf PHYS 2360 sec 006/007 A simple motor Name: Describing a simple motor mo tor (n) 1 one that imparts motion; specifically: PRIME MOVER 2 any of various power units that develop energy or impart motion: such as a: a small compact engine b INTERNAL COMBUSTION ENGINE es pecially: a gasoline engine c: a rotating machine that transforms electrical energy into mechanical energy 3 MOTOR VEHICLE; especially: AUTOMOBILE Definition from merriam-Webster.com Each of your groups has a kit that you can use to build a motor, you also have wire that you can form into a loop. The instructor will demonstrate how to operate the motor. In your kit, you should have: 1 plastic base 2 metal brackets 1 D-cell battery 1 penny-sized disc magnet 3 coils of wire (each with a different number of turns) Your report Which definition of motor does this device refer to? Based on the electromagnetic principles we have discussed in class, develop a model that describes why the loop is spinning. Predict how the length of wire (number of loops) changes how the loop spins. Get your prediction approved by an instructor before taking data. test your prediction. Describe that experinent, and present your results in the report.

Explanation / Answer

1. The device refers to the first definition of motor because it is based on electro magnetic principle and not on thermodynamics or chemical kinetics(fuel etc)

2. The coil rotates because the magnetic field imparts a force on a current carrying conductor and this force produces a torque about the centre of the loop

F=NIBL

F=force,

I= current

B= magnetic field

L= length of conductor

= No. OF TURNS

3. As per above formula, increasing the number of turns increases the force and hence increases the torque so, rotations will become faster

4. In the above apparatus, the rotations per minutes could be compared for more and less number if turns

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