Adc motor operates because the loop constantly rotates, therefore creating
a magnetism
b torque
c electricity
d wire

A DC motor operates because the loop or the coil constantly rotates and therefore creates a torque in the presence of the magnetic field created in between two magnetic poles.

Explanation:

Working of a DC Motor

A DC motor is composed of an armature which is a current carrying coil, placed in between two opposite ends of magnets (North and south poles). This armature works as an electromagnet when places in the magnetic field of two magnet poles.

It thus, experiences a force according to the right hand rule and the torque is created with the interplay of the fixed magnetic field and the flow of current in the armature.

There are two brushes linked with two commutators that are further attached with the ends of the coils. The brushes are directly connected with the two terminals of the battery.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.