Home
Class 12
PHYSICS
A long straight wire in the horizontal p...

A long straight wire in the horizontal plane carries a current of 75 A in north to south direction, magnitude and direction of field B at a point 3 m east of the wire is

A

`4xx10^(-6)T`, vertical up

B

`5xx10^(-6)T`, vertical down

C

`5xx10^(-6)T`, vertical up

D

`4xx10^(-6)T`, vertical down

Text Solution

Verified by Experts

The correct Answer is:
C
From Ampere circuital law
`ointvecB.vec(dl)=mu_(0)I_("enc")`
`Bxx2piR=mu_(0)I_("enc")`
`B=(mu_(0)I_("enc"))/(2piR)=2xx10^(-7)xx(75)/(3)=5xx10^(-6)T`
The direction of field at the given point will be vertical up determined by the screw rule or right hand rule.
Promotional Banner

Topper's Solved these Questions

  • MOVING CHARGES AND MAGNETISM

    NCERT FINGERTIPS|Exercise The Solenoid And The Toroid|5 Videos

  • MOVING CHARGES AND MAGNETISM

    NCERT FINGERTIPS|Exercise Force Between The Parallel Currents, The Ampere|6 Videos

  • MOVING CHARGES AND MAGNETISM

    NCERT FINGERTIPS|Exercise Magnetic Field On The Axis Of A Circular Current Loop|8 Videos

  • MAGNETISM AND MATTER

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • NUCLEI

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

A long straight wire in the horizontal plane carries as curret of 75 A in north to south direction, magnitude and direction of field B at a point 3 m east of the wire is

A long straight wire in the horizontal plane carries a current of 50A in north to south direction. Give the magnitude and direction of vecB at a point 2*5m east of the wire.

50 A current in north to south direction. Give the magnitude and direction of vecB at a point 2.5 m east of the wire.

A long straight wire along the z-axis carries a current I in the negative z-direction. The magnetic vector field B at a point having coordinate (x,y) on the z=0 plane is:

A straight wire carries a current of 6A from south to north direction. What is the magnetic field due to 1cm piece of wire at a point 50cm , 30^@ east of north?

If a long straight wire carries a current of 40 A, then the magnitude of the field B at a point 15 cm away from the wire is

A long straight wire carries a current of 35 A. What is the magnitude of the field vecB at a point 20 cm from the wire?