Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field by both coils, if the same current is flown
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(a) 1: |
(b) 1 : 2 |
(c) 2 : 1 |
(d) |
(a) 1: 
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A solenoid of length l metre has self-inductance L henry. If number of turns are doubled, its self inductance
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(a) Remains same |
(b) Becomes 2L henry |
|
(c) Becomes 4L henry |
(d) Becomes |
A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image
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(a) 5 mm |
(b) 1 mm |
(c) 0.5 mm |
(d) 0.1 mm |
Assertion : At 0 K Germanium is a superconductor.
Reason : At 0 K Germanium offers zero resistance.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Three capacitors each of capacitance 1μF are connected in parallel. To this combination, a fourth capacitor of capacitance 1μF is connected in series. The resultant capacitance of the system is
|
(a) 4μF |
(b) 2μF |
(c) |
(d) |
