Physics
Working of safety fuses depends upon1. magnetic effect of the current2. chemical effect of the current3. magnitude of the current4. heating effect of the currentSelect the correct answer using the code given below.

1, 2 and 3 only
3 and 4 only
4 only
1, 2, 3 and 4

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Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of nucleons
the same number of protons but different number of neutrons
equal number of protons and electrons

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