1.

A current of 10 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due north on the table is

Answer»

`2xx10^(-5)` T , acting downwards.
`2xx10^(-5)` T , acting upwards.
`4xx10^(-5)` T , acting downwards.
`4xx10^(-5)` T , acting upwards.

Solution :[HINT : `B=(mu_0I)/(2pir)=((2xx10^(-7))xx10)/(0.1)=2xx10^(-5)` .T As PER right HAND thumb rule B is DIRECTED vertically downward]


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