A magnet when placed perpendicular to a uniform field of strength 
experiences a maximum couple of moment 4 
. What is its magnetic moment
|
(a) 0.4 |
(b) 0.2 |
(c) 0.16 |
(d) 0.04 |
(a) 0.4 
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Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m between them. If P and Q carry current of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half way between the wires is
|
(a) |
(b) |
(c) |
(d) |
When the object is self-luminous, the resolving power of a microscope is given by the expression
|
(a) |
(b) |
(c) |
(d) |
A double charged lithium atom is equivalent to hydrogen whose atomic number is 3. The wavelength of required radiation for emitting electron from first to third Bohr orbit in 
will be (Ionisation energy of hydrogen atom is 13.6eV)
|
(a) 182.51 Å |
(b) 177.17 Å |
(c) 142.25 Å |
(d) 113.74 Å |
A fully charged capacitor has a capacitance ‘C’. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity ‘s’ and mass ‘m’. If the temperature of the block is raised by ‘ ∆T ’, the potential difference ‘V’ across the capacitance is
|
(a) |
(b) |
(c) |
(d) |
