Follow these steps. 1. Leaving about 8 inches of wire loose at one end wrap the wire around the nail make 5 wraps. Try not to overlap the wire at any point. 2. Connect each end of the wire to an end of the battery by taping it in place. (See diagram above). 3. See how many small paperclips your battery can pick up. Record this in your electromagnet data table. 4. Repeat step 3 two more times. Then take an average of the number of paperclips. 5. Disconnect the battery and make an additional 5 wraps of the wire, for a total of 10 wraps. 6. See how many small paperclips your battery can pick up. Record this in your electromagnet data table. 7. Repeat step 6 two more times. Then take an average of the number of paperclips. 8. Disconnect the battery and make an additional 5 wraps, for a total of 15 wraps. 9. See how many small paperclips your battery can pick up. Record this in your electromagnet data table. 10. Repeat step 9 two more times. Then take an average of the number of paperclips.​

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car a and b are moving in opposite directions

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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.