Physics
Magnetic field lines about a current-carrying wire

Circle the wire in closed loops
None of these
Extend radially from the wire
Both of these

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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Reach a particular height and start coming down
Burst after reaching some height
Continue going upwards uninterrupted

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Physics
Which of the following options correctly explains the term heat budget?

It is the radiation from the earth in the form of long waves.
It is the balance between incoming and outgoing radiation
It is the amount of heat which the surface of earth receives from the sun.
It is a mode of transfer of heat through matter by molecular activity.

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