biot 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

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

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

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