Faraday discovered that when he moved a magnet near a wire , a voltage is generated across it . When the magnet was held stationary , that is if we don't move the magnet then no voltage is generated .
This means voltage exists only when the magnet was moving . We call this voltage as " INDUCED EMF ( E ) " . This also means voltage existed because of magnetic field . This field has both horizontal and vertical components. But only vertical component contributes to the generation of electricity . Let theta be the angle between the normal and vertical component of magnetic field . Then , Faraday's law can be written as , Induced voltage E is proportional to the rate of change of magnetic flux ' theta ' . through the area of loop of conductor . This voltage is denoted with the negative sign to indicate that the voltage opposes the rate of change of magnetic flux . |
Tuesday, October 20, 2015
Faraday's law of electro magnetic induction
Sunday, October 11, 2015
Hanuman challenged Arjun .....
Hanuman was present in the times of Ramayan . How can he be present in Mahabharat time? The answer to this question is Hanuman is immortal .
Means , there is no death for Hanuman.
Once Arjun went to Rameshwaram , to visit the place where Ram had worshipped God Shiv before leaving for Lanka.
That time , he visited the famous bridge to Lanka from Rameshwaram through sea. Now it is in ruins. Since the bridge was made of large stones , stones were dislocated.
By seeing this, the great archer himself , Arjun pitied about condition of Ram who had taken the help of monkeys to construct the bridge.
Arjun said " Instead of asking monkeys for help , Ram could have construct the bridge with arrows . Then it would have been permanent ".
A monkey who was staying on nearby tree , heard Arjun's words.
It came infront of him and challenged Arjun to construct a bridge using arrows . Arjun accepted the challenge.
Soon bridge of arrows was ready !
Monkey said it will check the durability of bridge by itself .
Monkey started to walk on bridge. But wherever it was keeping its foot , there was a big pot . Soon bridge started to collapse !
This made Arjun to think about foolishness of his challenge .
Monkey was not an ordinary monkey , it was Hanuman himself !
Means , there is no death for Hanuman.
Once Arjun went to Rameshwaram , to visit the place where Ram had worshipped God Shiv before leaving for Lanka.
That time , he visited the famous bridge to Lanka from Rameshwaram through sea. Now it is in ruins. Since the bridge was made of large stones , stones were dislocated.
By seeing this, the great archer himself , Arjun pitied about condition of Ram who had taken the help of monkeys to construct the bridge.
Arjun said " Instead of asking monkeys for help , Ram could have construct the bridge with arrows . Then it would have been permanent ".
A monkey who was staying on nearby tree , heard Arjun's words.
It came infront of him and challenged Arjun to construct a bridge using arrows . Arjun accepted the challenge.
Soon bridge of arrows was ready !
Monkey said it will check the durability of bridge by itself .
Monkey started to walk on bridge. But wherever it was keeping its foot , there was a big pot . Soon bridge started to collapse !
This made Arjun to think about foolishness of his challenge .
Monkey was not an ordinary monkey , it was Hanuman himself !
Thursday, October 1, 2015
What is Tyndall Effect and example in our life ?
We all have seen ribbons of light peeking through window in the morning .This is just an example of Tyndall Effect.
What is Tyndall Effect?
This effect refers to scattering of light when it passes through a colloid system composed of smaller particles. One more example for this is ----
We have 2 jars of water . One jar contains pure water and other one contains water with impurities or particles. Now we will pass a beam of light through both of them..
The light passing through jar containing pure water emerges as it is , without any change . But when the light passes through the jar containing water with impurities , then light will undergo either reflection or refraction or both.
This effect is widely used in Chemistry labs .
What is Tyndall Effect?
This effect refers to scattering of light when it passes through a colloid system composed of smaller particles. One more example for this is ----
We have 2 jars of water . One jar contains pure water and other one contains water with impurities or particles. Now we will pass a beam of light through both of them..
The light passing through jar containing pure water emerges as it is , without any change . But when the light passes through the jar containing water with impurities , then light will undergo either reflection or refraction or both.
This effect is widely used in Chemistry labs .
Friday, September 11, 2015
Fooling the ALMIGHTY himself !
One day, a cow of farmer went missing. Farmer tried hard to locate it but is of no use. Finally , he prayed to God that if he is able to trace the cow because of god's grace , then he will sell it and give half of the money to God.
His prayer was answered. He got his cow back. Now it is the time for him to pay back God for his help.
Farmer thought cow must had traced the way back by itself. In that case , why to give half of the money by selling it to God?
Thinking like that he did a plan. He went to market with his goat together with cow. He started saying that cow and goat are for sale. It is compulsory to buy goat with the cow. Goat costs 3000 Rs and Cow costs 300 Rs !
Soon he sold both of them. Now price of cow is just 300 Rs. Out of that , he donated Rs 150 to nearby temple. He is relieved that he fulfilled his promise. !
His prayer was answered. He got his cow back. Now it is the time for him to pay back God for his help.
Farmer thought cow must had traced the way back by itself. In that case , why to give half of the money by selling it to God?
Thinking like that he did a plan. He went to market with his goat together with cow. He started saying that cow and goat are for sale. It is compulsory to buy goat with the cow. Goat costs 3000 Rs and Cow costs 300 Rs !
Soon he sold both of them. Now price of cow is just 300 Rs. Out of that , he donated Rs 150 to nearby temple. He is relieved that he fulfilled his promise. !
Friday, September 4, 2015
Marriage of Shri Krishna with Mitravinda
Sri Krishna had 16,008 wives . Out of them , 8 were crowned wives of him . Mitravinda is one among them .
Mitravinda had 2 brothers , by the name Vinda and Anuvinda . Her brothers were the friends of Kourava king , Duryodhan . They wanted their sister , Mitravrinda , to marry Duryodhan .
But Krishna and Mitravrinda were loving each other . Mitravrinda said her wish to marry Krishna . But her brothers did not agree for it .
Swayamvara was arranged . Mitravrinda had suggested Krishna to abduct her . Krishna was successful in the plan of abduction . Duryodhan and all the other princes
who had come for Swayamvara chased them.
Finally , Krishna defeated all of them in the fight and married Mitravinda in Dwaraka .
Mitravinda had 2 brothers , by the name Vinda and Anuvinda . Her brothers were the friends of Kourava king , Duryodhan . They wanted their sister , Mitravrinda , to marry Duryodhan .
But Krishna and Mitravrinda were loving each other . Mitravrinda said her wish to marry Krishna . But her brothers did not agree for it .
Swayamvara was arranged . Mitravrinda had suggested Krishna to abduct her . Krishna was successful in the plan of abduction . Duryodhan and all the other princes
who had come for Swayamvara chased them.
Finally , Krishna defeated all of them in the fight and married Mitravinda in Dwaraka .
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