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

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.
Short wave broadcasts are made by nearby radio stations.

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