MCQ
Magnetic field inside a solenoid is:
- ADirectly proportional to its length.
- BDirectly proportional to current.
- CInversely proportional to total number of turns.
- DInversely porportional to current.
✓
Answer
- Directly proportional to current.
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 magnitude and direction of the current in the circuit shown will be
|
(a) |
(b) |
|
(c) 1 A from b to a through e |
(d) 1 A from a to b through e |
The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as
(a)
|
(b)
|
(c)
|
(d)
|
The maximum current that flows through a fuse wire before it blows out varies with its radius as
|
(a) |
(b) r |
(c) |
(d) |
A 6μF capacitor is charged from 10 volts to 20 volts . Increase in energy will be
|
(a) |
(b) 9 |
(c) 4.5 |
(d) 9 |
The example of nuclear fusion is
|
(a) Formation of barium and krypton from uranium |
|
(b) Formation of helium from hydrogen |
|
(c) Formation of plutonium 235 from uranium 235 |
|
(d) Formation of water from hydrogen and oxygen |
Two metal spheres of capacitance 
and 
carry some charges. They are put in contact and then separated. The final charges 
and 
on them will satisfy
|
(a) |
(b) |
(c) |
(d) |
Huygens principle of secondary waves:
The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
| (a) 4 sec | (b) 2 sec | (c) 0.5 sec | (d) 0.25 sec |
The interfering fringes formed by a thin oil film on water are seen in yellow light of sodium lamp. We find the fringes:
If 
and 
are respectively the filament resistances of a 200 watt bulb and 100 watt bulb designed to operate on the same voltage, then
|
(a) |
(b) |
|
(c) |
(d) |