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Recent questions tagged chap-6
Questions
A conducting wire XY of mass $m$ and negligible resistance slides smoothly on two parallel conducting wire as shown in the fig. The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field $B = B (+) \hat {k}$ If B is independent of time, obtain $V (t)$ assuming $V(0) = u_0$
cbsc
class12
physics
chap-6
electromagnetic-induction
sec-c
exemplar
difficult
asked
Jan 1, 2017
by
priyanka.c
1
answer
A magnetic field $B =B_o \sin(wt) \hat{k}$ covers a large region where a wire AB slides smoothly over two parallel conductors separated by a distance d, as shown in the fig. The wire are in the x-y plane. The wire AB (of length d) has resistance R and the parallel wires have negligible resistance. It AB is moving velocity $v$, what is the force needed to keep the wire at constant velocity ?
cbsc
class12
physics
chap-6
electromagnetic-induction
sec-c
exemplar
difficult
asked
Jan 1, 2017
by
priyanka.c
1
answer
A conducting wire XY of mass $m$ and negligible resistance slides smoothly on two parallel conducting wire as shown in the fig. The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field $B = B (+) \hat {k}$ write down the equation for the acceleration of the wire XY.
cbsc
class12
physics
chap-6
electromagnetic-induction
sec-c
exemplar
difficult
asked
Jan 1, 2017
by
priyanka.c
1
answer
A magnetic field in a certain region is given by $ B = B_0 cm (\omega t) \hat {k}$ and a coil of radius "a" with resistance R is placed in the x - y plane with its centre at the origin in the magnetic field, as shown in the fig. Find the magnitude and th direction of the current at (a, 0, 0) at $ t = \frac {\pi}{2\omega} \; and \; t = \frac {3 \pi}{2 \omega}$
cbse
class 12
physics
chap-6
sec-c
electromagnetic-induction
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A rectangular loop of wire ABCD is kept close to an infinitely long wire carrying a current $ I (t) = I_0 (1 - \frac {t}{T}) for $ 0 \leq t \leq T$ and $ I (0) = 0$ for t > T, as shown in the fig. Find the total charge passing through a given point in the loop, in time T, The resistance of the loop is R.
cbse
class 12
physics
chap-6
sec-c
electromagnetic-induction
exemplar
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Consider an infinitely long wire carrying a current I(t), with $ \frac {dI}{dt} = \lambda = constant$. Find the current produced in the rectangular loop of wire ABCD if its resistance is R, as shown in the fig.
cbse
class 12
physics
chap-6
sec-c
electromagnetic-induction
exemplar
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A magnetic field B is confined to a region $r \leq a$ and points out the paper (the Z axis) $ r = 0$ being the centre of the circular region. A charged ring (charge = Q) of radius b $b>a$ and mass m lies in the xy plane with its centre at the origin. the ring is free to rotate and is at rest. The magnetic field is brought to zero in time $\bigtriangleup t$. Find the angular velocity $\omega$ of the ring after the field vanister.
cbse
class 12
physics
chap-6
sec-c
electromagnetic-induction
exemplar
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Give the expression for average value of a.c voltage $V = V_0\; sin \omega t$ over time interval $ t = 0 \; to \; t = \frac {\pi}{\omega}$
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional question
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
An electrical element x connected to an alternating voltage source has current through it leading the voltage by $\frac {\pi}{2}$ radius. Identify x and write an expression for its reactance.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional question
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Self induction of an air core inductor increases from 0.01 MH to 10 MH on introducing an iron core into it. What is the relative permeability of the core used?
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional question
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
The dimension of $\frac {h}{e}$ is the same as that of magnetic flux $\phi$. Say true or false.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional question
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
The dimensions of electric and magnetic flux are same. Say true or false.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional question
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A coil of a metal wire is kept stationary in a non - uniform magnetic field. An emf is induced in the coil. Say true or false.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional question
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A magnetic field of 10T acts normal to a coil of 50 turns having $100 cm^2$ area. Find emf induced if the coil is removed from magnetic field in 0.1 sec.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A circular copper disc 10 cm in radius rotates at $20\pi$ rad/s about an axis through its centre and perpendicular to its disc. A uniform magnetic field of 0.2T acts perpendicular to the disc. Calculate the induced current if the resistance of the disc is $2\Omega$.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A circular copper disc 10 cm in radius rotates at $20\pi$ rad/s about an axis through its centre and perpendicular to its disc. A uniform magnetic field of 0.2T acts perpendicular to the disc. Calculate the potential difference developed between the axis of the disc and the rim.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A wheel with 50 metallic spokes each 0.5 m long is rotated with an angular speed of 12 radian /sec, in a plane normal to the earth's magnetic field. If the magnitude of the field is $ 0.5 \times 10^{-4}$ T, calculate the emf induced between the axle and the rim of the wheel.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A cylindrical bar magnet is kept along the axis of a circular coil and near it as shown in the fig. Will there be any induced e.m.f at the terminals of the coil, when the magnet is rotated about an axis perpendicular to the length of the magnet?
cbse
class
12
physics
chap-6
sec-a
electromagnetic-induction
additional
quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A cylindrical bar magnet is kept along the axis of a circular coil and near it as shown in the fig. Will there be any induced e.m.f at the terminals of the coil, when the magnet is related about its own axis.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional qust
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of $ 50 rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $ 3 \times 10^{-2} T$. It the coil forms a closed loop of resistance $ 10 \Omega$, calculate the power dissipated as heat.
cbse
class
12
physics
chap-6
sec-b
electromagnetic-induction
addditional
qust
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of $ 50 rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $ 3 \times 10^{-2} T$. Calculate the average emf.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of 50 $rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $ 3 \times 10^{-2} T$. Calculate the maximum emf induced in the coil.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Write a expression for mutual inductance of two coaxial solenoids.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Why are resistance coils usually double wound?
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
The rate of charge of magnetic flux has same units as induced e.m.f. Say true or false.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Why does a metallic piece very hot when it is surrounded by a coil carrying high frequency alternating current??
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additionalquest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A magnetic field of flux density $1.0 wb m^{-2}$ acts normal to a 80 turn coil of 0.01 m^2 area. Find the e.m.f induced in it, if this coil is removed from the field in 0.1 second.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A conducting circular loop is placed in a uniform magnetic field B = 0.020 T with its plane perpendicular to the field. The radius of the loop starts shrinking at a constant rate of 1.0 mm/s. Find the induced e.m.f in the loop at an instant when the radius is 2cm?
cbse
class 12
physics
chap-6
sec-c
electromagnetic-induction
additional quest
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A conducting wire of 100 turns is wound over 1cm near the centre of a solenoid of 100 cm length and 2 cm radius having 1000 turns. Calculate the coefficient of mutual inductance of the two solenoids.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
SI unit of magnetic flux is
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
The magnetic flux linked with a coil is $ \phi = (3t^2 - 2t + 1) $milli weber. The e.m.f induced in the coil at t = 1 sec is:
cbse
class
12
physics
chap-6
sec-a
electromagnetic-induction
additional
quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A wire of length 2m moves with a speed of 5 m/s perpendicular to a magnetic field of induction $0.1 wb/m^2$. The emf induced in the wire is
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Amount of change induced in a circuit of resistance R is given by
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A solenoid coil has 50 turns per cm along its length and a cross sectional area of $4cm^2$, 200 turns of another wire are wound round the first solenoid co-axially. The two coils are electrically insulated from each other. Calculate the mutual inductance between the two coils.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
Two coils have mutual inductance of 1.5 henry. If current in primary circuit is raised to 5 ampere in one millisecond after closing the circuit, what is the e.m.f induced in the secondary??
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
An e.m.f of 250 microvolt in induced in a coil when current in it changes from 10A to 6A in 0.4 second. What is the self inductance of the coil?
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
As soon as current is switched on a high voltage line, the bird sitting on it flies away. Why??
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
difficult
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
The magnetic flex through a coil perpendicular to its plane and directed into paper is varying according to the relation $\phi = (5t^2 + 10t + 5)$ milliwebers. Calculate the e.m.f induced in the loop.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A 2m long solenoid with diameter 4 cm and 2000 turns has a secondary of 1000 turns wound closely near it mid point. Calculate the mutual inductance between the two coils.
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
additional quest
easy
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
An aircraft with a wingspan of 40m flies with a speed of 1080 $km hr^{-1}$ in the eastward direction at a constant altitude in the northern hemisphere where the vertical component of earth's magnetic field is $1.75 \times 10^{-5} T$. Find the emf that develops between the tips of the wings.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A 12v battery connected to a $6 \Omega$, 10H coil through a switch drives a constant current in the circuit. Th switch is suddenly opened. Assuming that it took 1 millisecond to open the switch. Calculate the average e.m.f induced across the coil.
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
additional quest
medium
asked
Dec 30, 2016
by
suganyadevi.p
1
answer
A magnetic field B = $B_{\circ} sin(\omega t)\hat{k}$ covers a large region where a wire AB slides smoothly over two parallel conductors separated by a distance d, as shown in the fig. The wires are in the x - y plane. The wire AB (of length d) has resistance R and the parallel wires have negligible resistance. If AB is moving velocity $\upsilon$, what is the current in the circuit?
cbse
class 12
physics
chap-6
sec-c
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
There are two coils A and B separated by some distance. If a current of 2A flows through A, a magnetic flex of $10^{-2}$ wb passes through B (no current through B). If no current passes through A and a current of 1A passes through B, what is the flex through A?
cbse
class 12
physics
chap-6
sec-b
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
A (current vs time) graph of the current passing through a solenoid is shown in the fig. For which time is the back electromotive force (u) a maximum? If the back emf at t = 3s is e, find the emf at t = 40s
cbse
class12
physics
chap-6
sec-a
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
A (current vs time) graph of the current passing through a solenoid is shown in the fig. For which time is the back electromotive force (u) a maximum? If the back emf at t = 3s is e, find the emf at t = 15s
cbse
class 12
physics
chap-6
sec-a
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
Find the current in the wine PQ for the configuration as shown in the fig. Wire PQ has negligible resistance. B, the magnetic field is coming out of the paper. $\theta$ is a fixed angle made by PQ travelling smoothly over two conducting parallel wires separated by a distance d.
cbse
class 12
physics
sec-b
chap-6
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
Consider a closed loop C in a magnetic field as shown in the fig. The flex passing through the loop is defined by choosing a surface whose edge coincides with the loop and using the formula $\phi = B_1 . dA_1 + B_2 . dA_2 + ...........$ Now if we choose two different surfaces $S_1$ and $S_2$ having C as their edge, would we get the same answer for flex. Justify.
cbse
class 12
physics
sec-c
chap-6
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
Consider a metallic pipe with an inner radius of 1cm. If a cylindrical bar magnet of radius 0.8 cm is dropped through the pipe, it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metallic pipe. Explain.
cbse
class12
physics
sec-c
chap-6
electromagnetic-induction
asked
Dec 29, 2016
by
suganyadevi.p
1
answer
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