The diagram shows a positive charge moving in a magnetic field.

in which direction is the magnetic force acting on the charge?

into the screen
out of the screen
up
down

Direction of force = Upwards

Explanation:

As we know that force on a moving charge in magnetic field is given by

now here we can see that positive charge is moving towards left in magnetic field which is coming out of the plane

so here

now by solving the equation we have

so the force is along +Y direction that is upwards

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.

they should be similar or the same