- End-on position.
- Broadside-on position.
- Both.
- None.
Explanation:

Points lying on the axis of a magnet are called end-on points. In our case, the point on the axis of the loop (on replacing the circular loop with an equivalent magnetic dipole) lies on the axis of the magnetic dipole or on the end-on position.
If P was the point on the axis of the loop, then it is clear from the figure that P lies on the end-on position of the equivalent magnetic dipole.
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The magnitude of electric field E in the annular region of a charged cylindrical capacitor
|
(a) Is same throughout |
|
(b) Is higher near the outer cylinder than near the inner cylinder |
|
(c) Varies as 1/r, where r is the distance from the axis |
|
(d) Varies as |
The point representing the cut off grid voltage on the mutual characteristic of triode is

| (a) S | (b) R |
(c) O |
(d) P |
Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. It is charged at 100 volt. The electric field in volt/metre between the plates of the capacitor is
|
(a) 100 |
(b) 100000 |
(c) 25000 |
(d) 4000000 |
Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is
|
(a) 80 W |
(b) 176 W |
(c) 88 W |
(d) 36 W |
If mean wavelength of light radiated by 100 W lamp is 5000 Å, then number of photons radiated per second are
|
(a) 3 |
(b) 2.5 |
(c) 2.5 |
(d) 5 |
An electric line of force in the xy plane is given by equation
. A particle with unit positive charge, initially at rest at the point x = 1, y = 0 in the xy plane
|
(a) Not move at all |
|
(b) Will move along straight line |
|
(c) Will move along the circular line of force |
|
(d) Information is insufficient to draw any conclusion |