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The radius of a coil decreases steadily at the rate of `10^(–2)` m/s. A constant and uniform magnetic field of induction `10^(–3) Wb'/'m^2` acts perpendicular to the plane of the coil. The radius of the coil when the induced e.m.f. in the coil is `1muV`, is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A time varying voltage `V=2t` volt is applied across an ideal inductor of inductance `L=2H` as shown in figure. Then select incorrect

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A circular coil of 500 turns encloses an area of `0.04 m^2`. A uniform magnetic field of induction `0.25 Wb'/'m^2` is applied perpendicular to the plane of the coil. The coil is rotated by 90° in 0.1 second at a constant angular velocity about one of its diameters. A galvanometer of resistance `25Omega` was connected in series with the the coil. The total charge that will pass through the galvanometer is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A condenser of capacity `6 µF` is fully charged using a 6-volt battery. The battery is removed and a resistanceless 0.2 mH inductor is connected across the condenser. The current which is flowing through the inductor when one-third of the total energy is in the magnetic field of the inductor is

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For the circuit shown, which of the following statement(s) is(are)

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In the circuit shown the capacitor has charge Q. At `t=0` sec the key is closed. The charge on the capacitor at the instant potential difference across the inductor `L_1` is zero,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The figure shows a rod of length `l` with points A and B on it. The rod is moved in a uniform magnetic field `(B_0)` in different ways as shown. In which case potential difference `(V_A–V_B)` between `A & B` is

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A bent rod `PQR (PQ = QR =l)` shown here is rotating about its end P with angular speed `omega` in a region of transverse magnetic field of strength

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A conducting loop is kept so that its center lies at the origin of the coordinate system. A magnetic field has the induction B pointing along Z-axis as shown in the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Initially key was placed on (1) till the capacitor got fully charged. Key is placed on (2) at `t=0`. The time when the energy in both capacitor and inductor will be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For an LCR series circuit, phasors of current i and applied voltage `V=V_0 sinomegat` are shown in diagram at `t =0`. Which of the following is/are

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A cylindrical space of radius R is filled with a uniform magnetic induction B parallel to the axis of the cylinder. If `(dB)/(dt) =` constant, the graph, showing the variation of induced electric field with distance r from the axis of cylinder, isConsider a conducting circular loop placed in a magnetic field as shown in figure. When magnetic field changes with time, magnetic flux also changes and emf `e=-(dphi)/(dt)` is induced. If resistance of loop is R then induced current is `i=e/R`. For current, charges must have non–zero average velocity. Magnetic force cannot make the stationary charges to move. Actually

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A line charge `lambda` per unit length is pasted uniformly onto the rim of a wheel of mass m and radius R. The wheel has light non–conducting spokes and is free to rotate about a vertical axis as shown in figure.A uniform magnetic field B exist as shown in figure. What is the angular velocity of the wheel when the field is suddenly switched off?Consider a conducting circular loop placed in a magnetic field as shown in figure. When magnetic field changes with time, magnetic flux also changes and emf `e=-(dphi)/(dt)` is induced. If resistance of loop is R then

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The emf across `AB` at `t=l/(2v)` isA conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Potential difference across BC at time `t=l/(2v)` isA conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Find the applied horizontal force on BC, (F) as a function of time `'t' (t < l/v)`A conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An inductor `(X_L=2Omega)` a capacitor `(X_C=8Omega)` and a resistance `(8Omega)` is connected in series with an ac source. The voltage output of A.C source is given by `V=10 cos 2pi50t`. Find the instantaneous p.d. between A and B when the voltage output from source is half of its

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Figure shows a uniform circular loop of radius ‘a’ having specific resistance `rho` placed in a uniform magnetic fieldB perpendicular to plane of figure. A uniform rod of length 2a & resistance R moves with a velocity v as shown.Find the current in the rod when it has moved a distance `a/2` from the centre of circular loop.[Given `B=sqrt3,a=2,v=3,rho=9/(4pi), R=2sqrt3` all in SI

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for an electron (negative

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for a proton (positive

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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