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Same as problem 4 except the coil A is made to rotate about a vertical axis (Fig ). No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0,

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

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Consider a magnet surrounded by a wire with an on/off switch S (Fig ). If the switch is thrown from the off position (open circuit) to the on position (closed circuit), will a current flow in the circuit? Explain. Bar magnet N Circuit closed Bar magnet N Circuit open Fig.

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

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A rod of mass m and resistance R slides smoothly over two parallel perfectly conducting wires kept sloping at an angle θ with respect to the horizontal (Fig. ). The circuit is closed through a perfect conductor at the top. There is a constant magnetic field B along the vertical direction. If the rod is initially at rest, find the velocity of the rod as a function of

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

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An alternating current generator has an internal resistance Rg and an internal reactance Xg. It is used to supply power to a passive load consisting of a resistance Rg and a reactance XL. For maximum power to be delivered from the generator to the load, the value of XL is equal

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

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A coil has an area of 0.05 m2 & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , `4xx10^(–5) Wb/m^(-2)`. It is rotated through `90^o` in 0.1 sec. The average emf induced in the coil

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

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If `V = 100 sin 100 t volt and I = 100 sin (100 t +pi/3) mA` for an A.C. circuit then find out(a) phase difference between V and I (b) total impedance, reactance, resistance(c) power factor and power dissipated (d) components contains by

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

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A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5.0 A, what is the(i) total torque on the coil,(ii) total force on the coil,m2(iii) average force on each electron in the coil due to the magnetic field? (The coil is made of copper wire of cross-sectional area 10–5 , and the free electron density in copper is given to be about 1029

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

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In Fig. , the magnetic needle has magnetic moment 6.7 × 10–2 Am2 and moment of inertia I = 7.5 × 10–6 kg m2 . It performs 10 complete oscillations in 6.70 s. What is the magnitude of the magnetic

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A closely wound solenoid of 2000 turns and area of cross-section 1.6 × 10 –4 m2 , carrying a current of 4.0 A, is suspended through its centre allowing it to turn in a horizontal plane.(i) What is the magnetic moment associated with the solenoid?(ii) What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 × 10–2 T is set up at an angle of 30° with the axis of the

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

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Two identical current carrying coaxial loops, carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as

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

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Two long wires carrying current I1 and I2 are arranged as shown in Fig. The one carrying current I1 is along is the x-axis. The other carrying current I2 is along a line parallel to the y-axis given by x = 0 and z = d. Find the force exerted at O2 because of the wire along the x-axis.

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

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Electrification by rubbing two bodies together is due to transference of ............from one body to the

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Electric Field LinesAn electric field line in general is a curve drawn in such a way that the tangent to it at each point is in the direction of the electric field at that point. A field line is a space curve, i.e. a curve in three dimensions. Electric field lines are thus used to pictorially map the electric field around a charge or a configuration of charges.The density of field lines is more near the charge. Away from the charge, the field is weak, so the density of field lines is less.Choose the correct statement regarding electric lines of

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

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Unit of electrical potential

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The electric potential due to point charge `3nC` at distance of 9 cm

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The temperature `(T)` dependence of resistivity `(rho)` of a semiconductor is represented

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

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Magnetic Field of a SolenoidMohan tightly wound a very long copper wire on a PVC pipe and carefully took the pipe out. The two ends of the copper wire then attached to a battery. This cylindrical shape of copper wire showed few properties of a bar magnet. Later he found that it is called a solenoid and this solenoid is used in several devices such as door bell, relay switch etc. The magnetic field of a solenoid is given below.The magnetic field strength of a solenoid having n turns is `B=mu_0nl`, where, `I` is the current flowing in the solenoid.A

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

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AC Generator An AC generator produces electrical energy from mechanical work, just the opposite of what a motor does. In it, a shaft is rotated by some mechanical means, such as an engine or a turbine starts working and an emf is induced in the coil.It is based on the phenomenon of electromagnetic induction which states that whenever magnetic flux linked with a conductor (or coil) changes, an emf is induced in the coil. The change of flux is greatest at `theta` is equal to (take,`phi_B= NBAcos

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

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Suppose that the lower half of the concave mirror’s reflecting surface in Fig. is covered with an opaque (non-reflective) material. What effect will this have on the image of an object placed in front of the

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

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A Cassegrain telescope uses two mirrors as shown in Fig. Such a telescope is built with the mirrors 20mm apart. If the radius of curvature of the large mirror is 220mm and the small mirror is 140mm, where will the final image of an object at infinity

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

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