Answer:
<em>Installing interpoles in armature core helps to cut down the spark in DC generators. </em>
Explanation:
A dc generator has a split ring type commutator to convert ac current generated to dc. The commutator comes in contact with the brushes throughout the working of the generator. Sparks occur in this region of contact.
When current flows through the armature coil it produces armature flux which opposes the main flux. This is called armature reaction and is the reason for sparks.
Interpol's are small auxiliary poles placed between the main poles of the generator. They are wound by wires of a number of turns connected in series with the armature. Interpol's produce a field that cancels the magnetising field of the armature and thus cancels armature reaction.
Answer:
Sink
Explanation:
Water has a density of 1 g/cm³. Since the density of the rock is greater than the density of water, the rock will sink.
Answer:
Explanation:
q = Charge in the potassium ion =
e = Charge of electron =
= Change in potential =
Change in electric potential is given by
The energy is
HA in the graph represents a weak acid.
<h3>Explanation</h3>
Is HA an acid or a base?
Apply the Arrhenius Theory of Acids and Bases.
- Acids ionize in water to produce (or equivalently ) and a conjugate ion.
- Bases ionize in water to produce and a conjugate ion.
The equation in the picture shows that HA ionizes in water to produce ions. By the Arrhenius Theory of acids and bases, HA is an acid.
Is HA a weak acid or a strong acid?
Both weak and strong Arrhenius acids ionize in water to produce (or equivalently ) and a conjugate ion. However,
- Strong acids ionize completely. There would be nearly no acid left in the solution. Expect arrows ⇒ in only one direction in the equation.
- Weak acids also ionize, but only partially. There would be plenty of acid left in the solution. Expect two-sided arrows like ⇔ and two-sided harpoons like in the equation.
As seen in the bar chart, there are plenty of HA left after ionization. HA ionizes only partially. Also, the equation shows a two-sided arrow. As a result, HA is a weak acid.
<span>Acceleration is the change in
velocity. Since the car is moving with the constant velocity it has no
acceleration.
the car has no acceleration. Since there is still no change in the velocity of
the car. </span>