The split ring in the electric motor is also known as a commutator that consists of a simple ring or cylindrical shell which is split axially with the parts insulated from each other.

Split ring is used for reversing the direction of current in the coil. For the continuous rotation of the coil in the same direction, the current in the coil must be reversed. Therefore, after every half rotation of the coil the direction of the couple rotating the coil remains the same and the coil continues its rotation in the same direction.

Example: Hydrogenation of ethene involves the addition of two hydrogen atom across the double bond of ethene as a result saturated ethane is formed. The reaction is more favoured because of energy of the reactants is more compared to the energy of the product. The reaction is an example of an exothermic reaction.

CH₂ = CH₂ ? CH₃CH₃

Industrial application:

Adding more acid releases more heat. If you add water to acid, you form an extremely concentrated solution of acid initially. So much heat is released that the solution may boil very violently, splashing concentrated acid out of the container! ... So Always Add Acid to water, and never the reverse

Article 14

principal = 3000

R = 5%

Simple interest = PRT/100
 (3000×5×T)/100=600

T=4
Time=4yrs

Let the principal be x Rs.

Amount= 6600Rs.

Rate of interest= 8%.

Time= 4years.

S.I=Amount - principal.

(P*R*T)/100= 6600-x.

(x*8*4)/100=6600-x.

32x=(6600-x)100.

32x= 660000- 100x.

100x+32x=660000.

132x=660000.

x=660000/132.

x= 5000Rs.

So Principal= 5000Rs.

 (c) high retentivity and low coercivity.

(a) A ferromagnetic material becomes paramagnetic above the curie temperature.