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Keerthana Baskar
Subject: Physics
, asked on 2/3/18
Q. If they say the current is increasing in this direction, then what is the direction of current
Answer
4
Tanya Pandey
Subject: Physics
, asked on 2/3/18
Point 2
Answer
1
Sandra Saju
Subject: Physics
, asked on 2/3/18
If the distance between the primary coil and secondary coil increases ,how will it affect the mutual induction ?
Answer
1
Annabeth Chase
Subject: Physics
, asked on 1/3/18
Solve this plzzz..
Q.1. A closed coil of 50 turns of 300
$c{m}^{2}$
area and of is resistance 40
$\Omega $
is held at a right angle to an uniform field of
$2\times {10}^{-4}T$
. Find the charge induced in the coil, when it is turned through an angle of 30
$\xb0$
about an axis perpendicular to the field passing through the centre of the coil. (
Ans.
${10}^{-6}$
C)
Answer
1
Annabeth Chase
Subject: Physics
, asked on 1/3/18
Solve this plzzz...
Q.4. A coil of 100 turns is pulled in 0.04 s from the poles of a magnet, where its area includes a flux of
$40\times {10}^{-5}$
Weber per turn to a place where it includes a flux of
${10}^{-4}$
Wb per turn. Calculate the average emf induced in the coil.
(
Ans.
0.75 V)
Answer
1
Chaitanya Kapoor
Subject: Physics
, asked on 28/2/18
A metallic square loop ABCD of size 15 cm and resistance 1.0 Ω is moved at a uniform velocity of
v
m/s, in a uniform magnetic field of 2 T, the field lines being normal to the plane of the paper. The loop is connected to an electrical network of resistors, each of resistance 2 Ω. Calculate the speed of the loop, for which 2 mA current flows in the loop.
Answer
1
Chaitanya Kapoor
Subject: Physics
, asked on 28/2/18
Solve
Q.7. (a) Give the direction of induced current in S when the resistance R is being increased.
Answer
1
Aishwarya Trivedi
Subject: Physics
, asked on 28/2/18
Consider the situation shown in the figure. The wires PQ & RS are made to slide on the rails with the same speed 5 cm/s. Find the electric current in the 19
$\Omega $
resistor if (a) if both wires move towards right and (b) if PQ moves towards left but RS moves towards right.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 27/2/18
Q.25. A rod of length 'l' rotated in plane of paper about an axis through one end and perpendicular to the plane of paper with angular velocity
$\omega $
. Calculate the induced e.m.f across its ends if a magnetic field of intensity
$\overrightarrow{B}$
acts
$60\xb0$
with the plane of the paper.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 27/2/18
Solve this:
Q.21. A coil of 50 turns having a resistance 2
$\Omega $
is connected to a galvanometer of 8
$\Omega $
. Calculate the induced current in the circuit if the magnetic flux changes from 0.1 weber to 0.2 weber in 0.1 sec.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 27/2/18
show that the electric charge flowing through a coil due to electromagnetic induction is independent of time in which the flux change take place.
Answer
1
Kurian J
Subject: Physics
, asked on 26/2/18
Explain induction motor as an application of edsy currents ?
Answer
2
Sandra Saju
Subject: Physics
, asked on 25/2/18
How are Eddy Currents produced ? ( no links please )
Answer
2
Sandra Saju
Subject: Physics
, asked on 25/2/18
Please help with this question and no links please.
Q.
In the given circuit in the steady state, obtain the expressions for (a) the potential drop (b) the charge and (c) the energy stored in the capacitor, C.
Answer
1
Shivam Sharma
Subject: Physics
, asked on 24/2/18
Solve this:
30.
A â€‹metallic rod of length l and resistance R is rotated with a frequency v, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius l, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere.
(i) Derive the expression for the induced emf and the current in the rod.
(ii) Due to the presence of the current in the rod and of the magnetic field, find the expression for the magnitude and direction of the force acting on this rod.
(iii) Hence, Obtain the expression for the power required to rotate the rod.
Answer
1
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Q.1. A closed coil of 50 turns of 300 $c{m}^{2}$ area and of is resistance 40 $\Omega $ is held at a right angle to an uniform field of $2\times {10}^{-4}T$. Find the charge induced in the coil, when it is turned through an angle of 30$\xb0$ about an axis perpendicular to the field passing through the centre of the coil. (

Ans.${10}^{-6}$ C)Q.4. A coil of 100 turns is pulled in 0.04 s from the poles of a magnet, where its area includes a flux of $40\times {10}^{-5}$ Weber per turn to a place where it includes a flux of ${10}^{-4}$ Wb per turn. Calculate the average emf induced in the coil.

(

Ans.0.75 V)vm/s, in a uniform magnetic field of 2 T, the field lines being normal to the plane of the paper. The loop is connected to an electrical network of resistors, each of resistance 2 Ω. Calculate the speed of the loop, for which 2 mA current flows in the loop.Q.7. (a) Give the direction of induced current in S when the resistance R is being increased.

Q.21. A coil of 50 turns having a resistance 2$\Omega $ is connected to a galvanometer of 8$\Omega $. Calculate the induced current in the circuit if the magnetic flux changes from 0.1 weber to 0.2 weber in 0.1 sec.

Q.In the given circuit in the steady state, obtain the expressions for (a) the potential drop (b) the charge and (c) the energy stored in the capacitor, C.30.A â€‹metallic rod of length l and resistance R is rotated with a frequency v, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius l, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere.(i) Derive the expression for the induced emf and the current in the rod.

(ii) Due to the presence of the current in the rod and of the magnetic field, find the expression for the magnitude and direction of the force acting on this rod.

(iii) Hence, Obtain the expression for the power required to rotate the rod.