Suppose the spheres A and B in Exercise 12 have identical sizes. A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second, and finally
removed from both. What is the new force of repulsion between A and B?

The figure below shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?

Consider a uniform electric field E = 3 × 10 ³ î N/C.

(a) What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the y z – plane?

(b) What is the flux through the same square if the normal to its plane makes a 60 ° angle with the x-axis?

What is the net flux of the uniform electric field of Exercise 1.15 through a cube of side 20 cm oriented so that its faces are parallel to the coordinate planes?

A point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?

एनहाइड्रस अमोनिया में पाया जाता है ?

(A) 82% नत्रजन

(B) 70% नत्रजन

(C) 46% नत्रजन

(D) 20% नत्रजन

वी.ए.एम. किसका अवशोषण बढ़ाता है ?

(A) नत्रजन

(B) फॉस्फोरस

(C) लौह

(D) उपरोक्त सभी का

भारत में विकसित धान की प्रथम प्रजाति है ?

(A) जया

(B) जगन्नाथ

(C) बाला

(D) पंकज

कार्बनिक मृदा में भार के आधार पर कार्बनिक पदार्थ की मात्रा होती है ?

(A) > 20%

(B) > 15%

(C) > 10%

(D) > 5%

लवणीय मृदा का pH होता है ?

(A) <7.5

(B) < 8.5

(C) > 8.5

(D) > 10.0

मृदा का पौधों के सम्बन्ध में अध्ययन को कहते हैं ?

(A) पेडोलॉजी

(B) इडैफोलॉजी

(C) क्लाइमेटोलॉजी

(D) एग्रो-क्लाइमेटोलॉजी