BIOT AND SAVART LAW

The magnetic field lines near a long straight wire carrying current are:

• Straight lines

• Concentric rings

• Spiral lines

• Radial lines

According to right hand thumb rule the direction of magnetic field in a current carrying straight conductor is denoted by:

• Thumb

• Curl fingers

• Middle finger

• First finger

Refer the diagram. The right face of the loop acts as North pole and left side of loop acts as south pole

• False

• True

 The magnetic field at the center O' of the following current loop is

• 
• 
• 
• 

The strength of the magnetic field at a point x near a long straight current carrying conductor is B. The field at a distance x/2 will be -----------

• B/2

• B/4

• 2 B

• 4 B

Magnetic field arises due to

• flow of steady current through a current element

• flow of charges

• flow of steady current through an infinite wire

• flow of steady current through a closed loop

A wire has current travelling to the right. What is the direction of the magnetic field above the wire?

• Up

• Down

• Into page

• Out of page

What is the unit of magnetic field?

• ampere

• watt

• kilowatt hour

• tesla

1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• A. Directed to the right

• A. Directed to the left

• A. Equal to the magnetic field

• In the same direction as the magnetic field

1) A straight wire carries a current inside the paper. What is the direction of the magnetic field at point P?

• Points to the right

• Points to the left

• Points to the top of the page

• Points to the bottom of the page