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Answers
Answer:37 questionAns: (i) when magnet is pushed near a bar magnet then it induces current due to electromagnetic induction.
(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper wire again the current is induced in the coil but this time it is in reverse direction.
(iii) When a bar magnet is held stationary inside the coil then no current is induced that’s why galvanometer will show no deflection.
38) ANSWER
Mendeleev's periodic table
Modern periodic table
1. Elements were arranged in increasing order of atomic masses. 1. Elements are arranged in increasing order of atomic numbers.
2. There are 8 groups. 2. There are 18 groups.
3. Each group is divided into subgroups a and b. 3. Groups are not divided into subgroups.
4. The group for noble gases was not present, as noble gases were not discovered at that time. 4. A separate group, i.e. group 18 is present for noble gases.
5. There was no place for isotopes. 5. This problem was rectified, as slots are determined on the basis of atomic number.
Step-by-step explanation:
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