Class 12 ISC Physics Moving Charges and Magnetism Board Questions
Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Moving Charges and Magnetism. These important notes,board questions and predicted questions are based on ISC board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
class 12 ISC Physics Moving Charges and Magnetism BoardQuestions
Moving Charges and Magnetism BoardQuestions
Q1
Write Biot Savart’s law in vector form.
solutions
solutions
Q2
A rectangular loop of area 5m2, has 50 turns and carries current of 1A. It is held in a
uniform magnetic field or 0.1 T at angle of 300. Calculate the torque experienced by the
coil.
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solutions
Q3
Along horizontal wire P carries a current of 50 A . It is rigidly fixed. Another wire Q is placed
directly above and parallel to P, as shown in figure below. The weight per unit length of the wire Q
is 0.025 Nm-1 and it carries a current of 25 A . Find the distance ‘r’ of the wire Q from
the wire P so that the wire Q remains at rest.
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solutions
Q4
Calculate force per unit length acting on the wire B due to the current flowing in the wire A. (see
figure below)
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solutions
Q5
A rectangular coil having 60 turns in area of 0.4 m2 is held at right angle to form a
uniform magnetic field of flux density 5 x 10-5 T. Calculate the magnetic flux passing
through it.
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solutions
Q6
Write an expression for force per unit length between two long current carrying wires, kept parallel
to each other, in vacuum and hence define an ampere, the SI unit of current.
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The ampere is that constant current which, if maintained in two straight parallel conductors of
infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would
give between these conductors a force equal to 2 x 10-7 newton per meter of length.
Force per unit length,
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The ampere is that constant current which, if maintained in two straight parallel conductors of
infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would
give between these conductors a force equal to 2 x 10-7 newton per meter of length.
Force per unit length,
F/ℓ=μ0/2π i1i2/R
Q7
Write the expression for the Lorentz force F in vector form.
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Lorentz force = magnetic force + electric force
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Lorentz force = magnetic force + electric force
F=[qVbsinθ+qe]
Hence, the required expression is F=[q∨bsinθ+qe]
Q8
If current through the conductor Y is reversed in direction will neutral point lie between X and Y
to the left of X or to the right of Y?
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solutions
Q9
Calculate magnetic flux density of the magnetic field at the centre of a circular coil of 50 turns
having radius of 0.5 m and carrying a current of 5 A.
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solutions
Q10
Using Ampere’s circuital law, obtain an expression for the magnetic flux density ‘B’ at a point ‘X’
at a perpendicular distance ‘r’ from long current carrying conductor. (Statement of the law is not
required)
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solutions
Q11
An electric current I flows through an infinitely long conductor as shown in figure below. Write an
expression and direction for the magnetic field at a point P
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solutions
Q12
An electric current I flow through a circular loop as shown in figure below. Write an expression and
direction for the magnetic field at the centre of the loop at point P
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solutions
Q13
PQ is a long straight conductor carrying a current of 3A as shown in figure below. An electron moves
with a velocity of 2 x 107 ms-1 parallel to it . Find the force acting on the
electron.
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solutions
Q14
A circular coil carrying a current I has a radius R and number of turns N . If all the 3 the current
I, radius R and number of turns N are double then magnetic field at its centre becomes:
(a) double
(b) half
(c) four times
(d) one fourth
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(a) double
(b) half
(c) four times
(d) one fourth
solutions
Q15
In moving charged particle q travelling around the positive X axis enters a uniform magnetic field
B. When will be the force acting on q be maximum?
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solutions
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