Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

3R/4
R/2
5R/4
2R

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the microwaves to get into the food through the holes
To prevent the steam pressure from bursting open the pouch
To allow the heat to get into the food through the hole
To allow the aroma of the food to come out through the holes

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