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

According to right hand thumb rule the direction of magnetic field in a current carrying circular coil is denoted by

• Thumb

• Middle finger

• Curl 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

Calculate the magnetic field due to a straight conductor of infinite length carrying a current of 3 A at a point 5 cm away from the center of conductor?

• 0.6 x 10^-5 T

• 1.2 X 10^-5 T

• 3 X 10^-5 T

• 12 X 10^-5 T

 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

Biot Savart law states

• Magnetic field has a net outward flow

• Magnetic field has no net outward flow

• Magnetic field and electric field are normal to each other

• Total magnetic flux coming out of a surface is total current enclosed

Amper's law states that

• total current enclosed by a current carrying loop is zero

• total magnetic field over a closed loop is equal to current carrying loop is permiability * current

• total electric field over a closed loop is equal to current carrying loop is permiability * current

• total current over a closed loop is equal to magnetic field enclosed by loop * permiability