The electric field of a plane electromag...

The electric field of a plane electromagnetic wave varies with time of amplitude `2Vm^-1` propagating along z-axis. The average energy density of the magentic field is (in `Jm^-3`)

`13.29xx10^(-12)`

`8.86xx10^(-12)`

`17.72xx10^(-12)`

`4.43xx10^(-12)`

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The correct Answer is:

Magnetic force on rod = BIl
Weight of the rof = mg
For no tension in wire, BIl = mg
`I=(mg)/(Bl)=(1xx10)/(2xx1)=5A`

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