- APotential difference between them.
- BMutual inductance between them.
- CElectric forces between them.
- DMagnetic forces between them.
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At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be
|
(a) 0.01 T |
(b) 0.02 T |
(c) 0.08 T |
(d) 0.16 T |
A 10
capacitor and a 20
capacitor are connected in series across a 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor
|
(a) |
(b) |
(c) 400 V |
(d) 200 V |
In the circuit given below, the value of the current is
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| (a) 0 amp |
(b) |
(c) |
(d) |
Three glass prisms A, B and C of same refractive index are placed in contact with each other as shown in figure, with no air gap between the prisms. Monochromatic ray of light OP passes through the prism assembly and emerges as QR. The conditions of minimum deviation is satisfied in the prisms

|
(a) A and C |
(b) B and C |
|
(c) A and B |
(d) In all prisms A, B and C |
The half life of a radioactive element which has only
of its original mass left after a lapse of 60 days is
|
(a) 12 days |
(b) 32 days |
(c) 60 days |
(d) 64 days |