Question

Sumedha took a spoon of turmeric powder and made a paste by adding a few drops of water.
She cut thin strips of paper and applied this paste to them. After drying, she put drops of the
following solutions on the strip:
i. Lemon juice
ii. Calcium hydroxide solution
iii. Common salt solution
iv. Baking soda solution
What would be the change in colour for each of
the solutions?
a. (i) Yellow (ii) Red (iii) Yellow (iv) Red
b. (i) Red (ii) Yellow (iii) Yellow (iv) Red
c. (i) Red (ii) Red (iii) Yellow (iv) Yellow
d. (i) Yellow (ii) Yellow (iii) Red (iv) Red​

Answer 1

Answer:

Let two charges +q and -q are placed in uniform electric field E and the distance between two charges =2l. Two forces act in opposite direction. Therefore, there is a couple of force which is called torque