Question
In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be
| (a) 4 : 1 | (b) 1 : 2 | (c) 2 : 1 | (d) 1 : 8 |
✓
Answer
(d) 1 : 8
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The output of a step-down transformer is measured to be 24V when connected to a 12 watt light bulb. The value of the peak current is:
The curve drawn between velocity and frequency of photon in vacuum will be a
|
(a) Straight line parallel to frequency axis |
|
(b) Straight line parallel to velocity axis |
|
(c) Straight line passing through origin and making an angle of 45o with frequency axis |
|
(d) Hyperbola |
An ammeter gives full deflection when a current of 2 amp. flows through it. The resistance of ammeter is 12 ohms. If the same ammeter is to be used for measuring a maximum current of 5 amp., then the ammeter must be connected with a resistance of
|
(a) 8 ohms in series |
(b) 18 ohms in series |
|
(c) 8 ohms in parallel |
(d) 18 ohms in parallel |
The work function of aluminium is 4.2 eV.If two photons each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be:
The radius of the convex surface of plano-convex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is
|
(a) 30 cm |
(b) 50 cm |
(c) 20 cm |
(d) 40 cm |
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is 
, the value of λ for tungsten is
|
(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |
The rest mass of the photon is
|
(a) 0 |
(b) ∞ |
|
(c) Between 0 and ∞ |
(d) Equal to that of an electron |
In broad-side-on position, the electric potential due to electric dipole is :
For a glass prism, the angle of minimum deviation will be smallest for the light of:
Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery
Reason : The current flows towards the point of the higher potential as it flows in such a circuit from the negative to the positive terminal.
|
(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. |