The direction of the magnetic field around the current-carrying c

SOLUTION

Right hand thumb rule:

• The Right hand thumb rule is used to determine the direction of magnetic field around a current carrying wire.
• This rule states that "when an electric current passes through a straight wire that is held by the right hand with the thumb pointing upwards and the fingers curling up the wire, the thumb points in the direction of the conventional current (from positive to negative), and the fingers point in the direction of the magnetic field".
• Below figure represents the direction of current and magnetic field through a straight current carrying conductor.

• According to the right-hand thumb rule, the magnetic field and wire carrying current both are perpendicular to each other.

 

Note:

Lenz's Law –

• According to this law, the direction of induced emf or current in a circuit is such as to oppose the cause that produces it.
• This law gives the direction of induced emf/induced current.
• This law is based upon law of conservation of energy.

 

Fleming's right hand –

• This rule states that if we arrange the thumb, the centre finger, and the forefinger of the right hand at right angles to each other, so that the thumb points towards the direction of the magnetic force, the centre finger gives the direction of induced current and the forefinger points in the direction of magnetic field . 
• Fleming's right-hand rule shows the direction of induced current.