Use Ampere's law to derive the formula for the magnetic field due to an infinitely long straight current carrying wire.

Important Questions on Magnetic Effect of Current

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Text Based Exercises>Q 5

Explain carefully why the derivation as in

(b)

is not valid for magnetic field in a plane normal to a current-carrying straight wire of finite length and passing through the midpoint of the axis.

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Text Based Exercises>Q 6

Show how Biot-Savart law can be alternatively expressed in the form of Ampere's circuital law. Use this law to obtain the expression for the magnetic field inside a solenoid of length

' l'

, cross-sectional area

' A'

having

' N'

closely wound turns and carrying a steady current

' I'

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Text Based Exercises>Q 6

Sketch the magnetic field lines for a finite solenoid. Explain why the field at the exterior midpoint is weak while at the interior, it is uniform and strong.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Text Based Exercises>Q 7

State Ampere's circuital law. Use this law to obtain the expression for the magnetic field inside an air cored toroid of average radius

' r'

, having

' n'

turns per unit length and carrying a steady current I. Show that the magnetic field in the open space inside and exterior to the toroid is zero.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Text Based Exercises>Q 7

An observer to the left of a solenoid of $N$ turns each of cross-section area $' A'$ observes that a steady current $I$ in it flows in the clockwise direction. Depict the magnetic field lines due to the solenoid specifying its polarity and show that it acts as a bar magnet of magnetic moment $m = N I A$ .

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