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• CBSE×
• Class 12 Science×
• Physics×
• Moving Charges And Magnetism×
• The Solenoid And Toroid×

# The Solenoid And Toroid Free Doubts and Solutions

## What is the force on a wire of legth 10 cm carrying a current of 5A placed at the centre of solenoid making an anglee of 45 degrees with its axis,if the solenoid produces a field of 0.5T?

Asked by Tanya raj 21st August 2015, 8:13 PM

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## (a) Draw the magnetic field lines due to a circular loop area carrying current I. Show that it acts as a bar magnet of magnetic moment  = I. (b) Derive the expression for the magnetic field due to a solenoid of length ‘2l’, radius ‘a’ having ’n’ number of turns per unit length and carrying a steady current ‘I’ at a point on the axial line, distance ‘r’ from the centre of the solenoid. How does this expression compare with the axial magnetic field due to a bar magnet of magnetic moment ‘m’?

Asked by Topperlearning User 10th July 2015, 10:28 AM

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## An electron is moving with a velocity v, along the axis of a long straight solenoid, carrying a current. What will be the force acting on the electron due to the magnetic field of the solenoid ?

Asked by Topperlearning User 20th May 2015, 2:53 PM

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## What is the length of a solenoid with total number of turns 1000, area of cross section 20 cm2 and self inductance of 4.02 × 10-3 H.

Asked by Topperlearning User 20th May 2015, 1:20 PM

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## A toroid coil has 1000 turns and diameter of 30 cm with the area of cross section of 2 cm2. Calculate i) inductance of coil ii) induced e.m.f when the a current of 2 A is reversed in 0.03 secs.

Asked by Topperlearning User 20th May 2015, 12:59 PM

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## If the current of 8 A in the primary circuit is reduced to 0 at a uniform rate in 10-2 secs. What is the induced e.m.f when the coefficient of mutual inductance is 4H?

Asked by Topperlearning User 20th May 2015, 10:44 AM

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## What is the unit of Self Inductance? Define.

Asked by Topperlearning User 20th May 2015, 10:41 AM

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## On what factors does the coefficient of mutual induction depends?

Asked by Topperlearning User 20th May 2015, 10:40 AM

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## In a system of two long solenoids a 1.5 m long solenoid with diameter of 6 cm and 1500 turns has a secondary of 1000 turns wound near its mid point. Calculate the mutual inductance.

Asked by Topperlearning User 20th May 2015, 10:40 AM

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## What is mutual induction?

Asked by Topperlearning User 20th May 2015, 10:24 AM

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## Derive the formula for self inductance of a solenoid ?

Asked by Topperlearning User 20th May 2015, 10:23 AM

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## What is self inductance ?

Asked by Topperlearning User 20th May 2015, 10:22 AM

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## Using Amperes Circuital law, derive an expression for the magnetic feild along the axis of toroidal solinoid.

Asked by Ayush 2nd February 2015, 8:09 AM

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## For magnetic field produced by a toroid we have two formulae: 1)B=permeability of free spacexnxi-for a normal toroid 2)B=(permeability of free spacexnxi)/2xpixr-for a toroid made from infinitely long solenoid. Which formula is to be used when the nature of the toroid i,e,.whether finite or infinite is not  clearly mentioned in the question?

Asked by Chandropal Parashor 11th July 2014, 6:55 AM