Athin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin. the disk carries a total charge of +3.00 ? c distributed uniformly over its surface. calculate the magnitude of the electric field due to the disk at the point x=15.0 cm along the x-axis. (? 0=8.85×10? 12 c

a. 9.95×109 n/c
b. 4.98×109 n/c
c. 3.31×109 n/c
d. 2.49×109 n/c
e. 1.99×109 n/c

option C

Explanation:

given,

radius = 30 cm

charge = + 3 μC

x = 15 cm

ε₀ = 8.85 x 10⁻¹² C²/N.m²

Electric on the x-axis of disk

E = 3.31 x 10⁵ N/C

Hence, the correct answer is option C

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.