Question

Q. diagrams correctly shows the magnetic field produced by a current- carrying wire?​

Answer 1

Answer:

Magnetic field at point P due to straight wire

B

=−B

z

^

From figure,

v

=−v

x

^

Magnetic force on the charge

F

=q(

v

×

B

)=q[(−v)

x

^

×(−B)

z

^

]=−qvB

y

^

Thus magnetic force on the charge particle acts towards the bottom of the page.

solution

Answer 2

Explanation:

Aim:

hand in such way that thumb is in the direction of current, then the curled

fingers show the direction of the magnetic field.

Observation:

We noticed that compass needles are directed as tangents to the

circle. It must be a circular line.

Conclusion:

So we conclude that current carrying wire produces magnetic field

and magnetic field lines are closed lines. The magnetic field lines due to straight

wire carrying the current is shown in figures 4(b) and 4(c). This can be verified by

sprinkling iron filings around the wire when current flows in the wire.