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Sandra Saju
Subject: Physics
, asked on 25/2/18
A circular coil of radius 10 cm, 500 turns and resistance 200 ohm is placed with its plane perpendicular to the horizontal component of the Earth's magnetic field. It is rotated about its vertical diameter through 180 degree in 0.25 s .Estimate the magnitude of the EMF and current induced in the coil. ( Horizontal component of the Earth's magnetic field at the places 3 ? 10-5 T).
Answer
1
Vinuthna Terala
Subject: Physics
, asked on 25/2/18
A current carrying conductor PQ of length 2 m, mass 808 × 10
–3
kg and resistance 100 mΩ is kept in uniform magnetic field of 4 mT.
(a) Find the direction of current through conductor if the conductor is balanced against its weight.
(b) Calculate the potential difference that must be applied to the conductor so that it remains in equilibrium in the magnetic field against its weight.
Answer
1
Vinuthna Terala
Subject: Physics
, asked on 25/2/18
↵
Pls
solve n send:
13. Master Naveen a student of Class Xii was doing physics investigator project on electromagnet. He mad a cylindrical shape coil with copper wire on an iron bar. He investigated that, how the strength of electron agent depends on various factors and showed his project to his friends and teacher.
a) What are the valuedisplay by Naveen ?
b) Name the cylindrical shaped coil.
c) Write any three factors on which strength of magnetic field produced by the coil depends.
Answer
1
Vinuthna Terala
Subject: Physics
, asked on 25/2/18
No links pls:
26. What do you mean by electromagnetic induction ? State Faraday's law of electromagnetic induction. Figure shows a rectangular conducting loop PQRS in which the arm PQ is free to move. A uniform magnetic field acts in the direction perpendicular to the plan on the loop. Arm PQ is moved with velocity V towards the arm Rs. Assuming that the arms QR, RS and PS have negligible resistance and moving arm PQ has resistance r, obtain the expression for .
a) The current in the loop b) the force required to move the arms PQ.
c) the power required to move the arm PQ d ) the direction of induced current in the loop PQRS.
Answer
1
Aditi
Subject: Physics
, asked on 23/2/18
solve qsn 8to 15 stepwise nd plz explain wherever necessary it's urgent
Answer
1
Ashlesha
Subject: Physics
, asked on 22/2/18
for this ques the final calculations anyhow is coming out to be 9.80 x 10^-3 though the book says its answer to be 0.01. so pls can u provide a detailed soln of this in case i m somewhere wrong pls guide. (no links plss.) (urgent).
Answer
1
Kurian J
Subject: Physics
, asked on 22/2/18
name and define any two magnetic elements of Earth's magnetic field at a place derive an expression for the angle of dip in terms of the horizontal component and resultant magnetic field of Earth at a given place
Answer
1
Mitali
Subject: Physics
, asked on 21/2/18
When we say earth's magnetic field is inclined at 45 degrees with the resultant magnetic field of a bar magnet at a point as stated in NCERT problem 5.15 how do we come to know that H= B??! What will be the conclusion if some other angle is given? How will do that ??!
Answer
1
Nithyashrri Saravanan
Subject: Physics
, asked on 20/2/18
Dear experts how is the direction of current in the coil found. Which rule is applied?:
Problem 2 A small magnet of magnetic movement M is placed at a distance r from the origin O with its axis parallel to x-axis as shown in Fig. 5.79. A small coil, of one turn is placed on the x-axis, at the same distance from the origin, with the axis of the coil coinciding with x-axis. For what value of current in the coil does a small magnetic needle, kept at origin, remains undeflected ? what is the direction of current in the coil ?
Answer
1
Ayesha Jahan
Subject: Physics
, asked on 20/2/18
Explain the solution.
Answer
1
Ayesha Jahan
Subject: Physics
, asked on 19/2/18
Solve this:
Answer
1
Ayushi Aggarwal
Subject: Physics
, asked on 18/2/18
Distinguish the magnetic properties of diamagnetic, paramagnetic and ferro- magnetic substances in terms of i. susceptibility ii. magnetic permeability, iii.coercivity. Give one example of each of these materials.
Draw the field lines due to an external magnetic field near i. Diamagnetic ii. paramagnetic substance
Answer
1
Chaitanya Kapoor
Subject: Physics
, asked on 16/2/18
Solve 11th:
11. The susceptibility of a magnetic material is 1.9 x 10
-5
. Name the type of magnetic material, it represents.
Answer
2
Ayushi Aggarwal
Subject: Physics
, asked on 7/2/18
Explain ques 8 and 9
Q8. The oscillating magnetic field in a plane electromagnetic wave is given by
8y = (8 × 10
–6
) sin [ 2 × 10
11
r + 300
π
x] T
(i) Calculate the wavelength of the electromagnetic wave.
(ii) Write down the expression for the oscillating electric field.
Q9. The work function of caesium is 2.14 eV. Find
(a) the threshold frequency for caesium, and
(b) the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60 eV.
Answer
3
Archana
Subject: Physics
, asked on 4/2/18
Magnetic field due to a bar magnet on axial and equatorial positions
are in textbook?
Will they be asked in board exam?
Answer
1
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What are you looking for?
(a) Find the direction of current through conductor if the conductor is balanced against its weight.
(b) Calculate the potential difference that must be applied to the conductor so that it remains in equilibrium in the magnetic field against its weight.
13. Master Naveen a student of Class Xii was doing physics investigator project on electromagnet. He mad a cylindrical shape coil with copper wire on an iron bar. He investigated that, how the strength of electron agent depends on various factors and showed his project to his friends and teacher.
a) What are the valuedisplay by Naveen ?
b) Name the cylindrical shaped coil.
c) Write any three factors on which strength of magnetic field produced by the coil depends.
26. What do you mean by electromagnetic induction ? State Faraday's law of electromagnetic induction. Figure shows a rectangular conducting loop PQRS in which the arm PQ is free to move. A uniform magnetic field acts in the direction perpendicular to the plan on the loop. Arm PQ is moved with velocity V towards the arm Rs. Assuming that the arms QR, RS and PS have negligible resistance and moving arm PQ has resistance r, obtain the expression for .
a) The current in the loop b) the force required to move the arms PQ.
c) the power required to move the arm PQ d ) the direction of induced current in the loop PQRS.
Problem 2 A small magnet of magnetic movement M is placed at a distance r from the origin O with its axis parallel to x-axis as shown in Fig. 5.79. A small coil, of one turn is placed on the x-axis, at the same distance from the origin, with the axis of the coil coinciding with x-axis. For what value of current in the coil does a small magnetic needle, kept at origin, remains undeflected ? what is the direction of current in the coil ?
Draw the field lines due to an external magnetic field near i. Diamagnetic ii. paramagnetic substance
11. The susceptibility of a magnetic material is 1.9 x 10-5. Name the type of magnetic material, it represents.
Q8. The oscillating magnetic field in a plane electromagnetic wave is given by
8y = (8 × 10–6) sin [ 2 × 1011 r + 300 x] T
(i) Calculate the wavelength of the electromagnetic wave.
(ii) Write down the expression for the oscillating electric field.
Q9. The work function of caesium is 2.14 eV. Find
(a) the threshold frequency for caesium, and
(b) the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60 eV.