Four metal conductors having different shapes
1. A sphere 2. Cyclindrical
3.Pear 4.Lightning conductor
Are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is

Four metal conductors having differnet shapes i. a sphere ii. Cylindrical iii. Pear iv. Lightening conductor are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is

Three metal spheres A,B and C are mounted on insulating stands. The spheres are touching one another, as shown in the diagram A strong positively charged object it brought near sphere A and a strong negative charge is brought near sphere C. While the charged objects remains near spheres A anc C, sphere B is removed by means of its insulating stand. After the charged objects are removed, sphere B is first touched to sphere A and then to sphere C. The resulting charge on B would be-

A conducting sphere S_1 of radius r is attached to an insulating handle. Another conduction sphere S_2 of radius R is mounted on an insulating stand. S_2 is initially uncharged. S_1 is given a charge Q brought into contact with S_2 and removed. S_1 is recharge such that the charge on it is again Q and it is again brought into contact with S_2 and removed. This procedure is repeated n times. Find the electrostatic energy of S_2 after n such contacts with S_1 .

A conducting sphere S_1 of radius r is attached to an insulating handle. Another conduction sphere S_2 of radius R is mounted on an insulating stand. S_2 is initially uncharged. S_1 is given a charge Q brought into contact with S_2 and removed. S_1 is recharge such that the charge on it is again Q and it is again brought into contact with S_2 and removed. This procedure is repeated n times. What is the limiting value of this energy as n rarrinfty ?

A conductor in the shape of a cylindrical shell of outer and inner radii 2r and r is connected to an ideal battery as shown. The length of the conductor is m. The charge carrier density in the conductor is n times 8 times 10^28 3^-3 The value of r=1/6 cm If the current through the battery is 4A, the drift velocity of electrons at a distance 1.5r from the axis of the conductor is ___________ times 10^-6 m//s .

Why does a spherical conductor retain its charge for a longer time in comparison with conductors of any other shape?

There are two uncharged identicasl metallic spheres 1 and 2 of radius r separated by a distance d(dgtgtr) . A charged metalllic sphere of same radius having charge q is touched with one of the sphere. After some time it is moved away fom the system. Now, the uncharged sphere is earthed. Charge on earthed sphere is

There are two uncharged identicasl metallic spheres 1 and 2 of radius r separated by a distance d(dgtgtr) . A charged metalllic sphere of same radius having charge q is touched with one of the sphere. After some time it is moved away fom the system. Now, the uncharged sphere is earthed. Charge on earthed sphere is

A stream of electrons with kinetic energy equal to 100 keV pass across a cross setion of a conductor in 0.5 s . If the potential difference between the ends of conductor is 5 V find the number of electrons that pass across the conductor in one second. (The charge on an electron is 1.6 xx 10^(-19)C ).

A one coulomb charge is placed on an insulated stand at the centre of a spherical conductor of radius Im. The sphere is given a charge of 1C. The electrostatic force experienced by the charge at the centre will be :