A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge -Q. The radius of the sphere is a and that of the spherical shell is b(b > a). What is the electric field at a distance R(a < R < b) from the centre
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(a) |
(b) |
(c) |
(d) |
(c) 
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$\text{v}_0=0,\ \text{a}_0=0$
$\text{v}_0=0,\ \text{a}_0\neq0$
$\text{v}_0\neq0,\ \text{a}_0=0$
$\text{v}_0\neq0,\ \text{a}_0\neq0$
The distance between the circular plates of a parallel plate condenser 40mm in diameter, in order to have same capacity as a sphere of radius 1 metre is
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(a) 0.01 mm |
(b) 0.1 mm |
(c) 1.0 mm |
(d) 10 mm |
Which is the correct relation for forbidden energy gap in conductor, semi conductor and insulator
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(a) |
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(b) |
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(c) |
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(d) |
Mixed 
and 
ions (mass of 
and that of 
beam passes a region of constant perpendicular magnetic field. If kinetic energy of all the ions is same then
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(a) |
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(b) |
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(c) All the ions will be deflected equally |
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(d) No ions will be deflected |
Assertion : The induced e.m.f. and current will be same in two identical loops of copper and aluminium, when rotated with same speed in the same magnetic field.
Reason : Induced e.m.f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If assertion is false but reason is true. |
