Answer these two MCQ ASAP.

Dear Student
When a straight wire carries an electric current, magnetic lines of forces exist and they are circular lines encircling the wire, can be determined using right hand screw rule.
So option a and b are correct.

24. THe magnetic field due to a dipole varies inversly as cube of the distance as
B = 2kM/r3
Where M is moment

So correct option is c



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