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qUESTIONS

Consider a thin square sheet of side L and thickness t, made of a material of resistivity p. The resistance between two opposite faces, shown by the shaded areas in the figure is [2010]

MCQs-PYQs-12th-jee

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is

In an aluminium (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure. The electrical resistivities of Al and Fe are 2.7×10^-8 Ωm and 1.0×10^-7 Ωm, respectively. The electrical resistance between the two faces P and Q of the composite bar is [2015]

MCQs-PYQs-12th-jee

A coil of resistance 400Ω is placed in a magnetic field. If the magnetic flux ф (Wb) linked with the coil varies with time t (sec) as ф = 50t2 + 4. The current in the coil at t = 2 sec is

MCQs-PYQs-12th-jee

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field .The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is

MCQs-PYQs-12th-jee

A circular disc of radius 0.2 m is placed in a uniform magnetic field of induction 1/π(Wb/m) in such a way that is axis makes an angle of 60° with vector B. The magnetic flux linked with the disc is

MCQs-PYQs-12th-jee

In a coil of resistance. 10Ω, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in Weber is

MCQs-PYQs-12th-jee

A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity V, = vi. The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for

MCQs-PYQs-12th-jee

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is

MCQs-PYQs-12th-jee

A conducting circular loop is placed in a uniform magnetic field, B=.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1mms-1, The induced e.m.f. when radius is 2cm, is

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