Apositively charged non-metal ball a is placed near metal ball b. prove that if the charge on b is positive but of small magnitude, the balls will be attracted to each other.

a. the positive charges on the sphere b move to the side closer to sphere a, while the negative charges move to the side further away from sphere a. the polarization of charge on a will cause a greater attractive force than the repulsion of the like charges.

b. the negative charges on the sphere a move to the side closer to sphere b, while the positive charges move to the side further away from sphere b. the polarization of charge on a will cause a greater attractive force than the repulsion of the like charges.

c. the positive charges on the sphere b move to the side closer to sphere a, while the negative charges move to the side further away from sphere a. the polarization of charge on b will cause a greater attractive force than the repulsion of the like charges.

d. the negative charges on the sphere b move to the side closer to sphere a, while the positive charges move to the side further away from sphere a. the polarization of charge on b will cause a greater attractive force than the repulsion of the like charges.

D

Explanation:

Ball A is a non positively charged non metal while ball B is metal ball.

Given: The ball B positive charge of small magnitude

To prove: Balls will attract each other

IN this condition because of induction negative charges on the sphere B move to the side closer to sphere A,(induction charging) while the positive charges move to the side further away from sphere A. The polarization of charge on B will cause a greater attractive force than the repulsion of the like charges.

Hence the correct answer will be D .

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.