Recent questions tagged #mcq

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In Fig., two positive charges q2 and q3 fixed along the y axis, exert a net electric force in the + x direction on a charge q1 fixed along the x axis. If a positive charge Q is added at (x, 0), the force on

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

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A point positive charge is brought near an isolated conducting sphere (Fig. 1.2). The electric field is best given

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The Electric flux through the

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

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Five charges q1, q2, q3, q4, and q5 are fixed at their positions as shown in Fig. S is a Gaussian surface. The Gauss’s law is given by`oint_0^1 vec E cdot vec (ds)=q/epsilon_0` Which of the following statements is correct?

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

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Fig. shows electric field lines in which an electric dipole p is placed as shown. Which of the following statements is

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

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A point charge +q, is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane

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

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A hemisphere is uniformely charged positively. The electric field at a point on a diameter away from the centre is

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

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A positive charge Q is uniformly distributed along a circular ring of radius R. A small test charge q is placed at the centre of the ring as shown in then

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

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A square of side L meters lies in the x-y plane in a region, where the magnetic field is given by `B =B_o (2hati + 3hatj + 4hatk)` where Bo is constant. The magnitude of flux passing through the square

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

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A loop, made of straight edges has six corners at A(0,0,0), B(L,O,0) C(L,L,0), D(0,L,0) E(0,L,L) and F(0,0,L). A magnetic field ` B=B_o( hati +hat k)T` is present in the region. The flux passing through the loop ABCDEFA (in that order)

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

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A cylindrical bar magnet is rotated about its axis (Fig ). A wire is connected from the axis and is made to touch the cylindrical surface through a contact.

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

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There are two coils A and B as shown in Fig A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer

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

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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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The self inductance L of a solenoid of length l and area of crosssection A, with a fixed number of turns N increases

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A metal plate is getting heated. It can be

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

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An e.m.f is produced in a coil, which is not connected to an external voltage source. This can be due

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

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The mutual inductance M12 of coil 1 with respect to coil

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A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be

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

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If the rms current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 seconds after its value becomes zero

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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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