- ACapacitance decreases.
- BCapacitance remains same.
- CCapacitance increases.
- DDepends upon the material of the dielectric.
Explanation:
When a dielectric material is inserted between the plates of the parallel plate capacitor, the capacitance of the capacitor increases with a factor of K. That is C = KC0.
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The decay constant λ of the radioactive sample is the probability of decay of an atom in unit time, then
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(a) λ decreases as atoms become older |
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(b) λ increases as the age of atoms increases |
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(c) λ is independent of the age |
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(d) Behaviour of λ with time depends on the nature of the activity |

The resultant capacitance between A and B in the following figure is equal to
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(a) 1 μF |
(b) 3 μF |
(c) 2 μF |
(d) 1.5 μF |
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

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(a) Is zero |
(b) Decreases as |
(c) Increases as r |
(d) Decreases as |