- AArea of the plate is decreased.
- BArea of the plate is increased.
- CDistance between the plates increases.
- DNone of the option.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A thin circular wire carrying a current I has a magnetic moment M. The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment
|
(a) M |
(b) |
(c) |
(d) |
If the voltage of X-ray tube is doubled, the intensity of X-rays will become
|
(a) Half |
(b) Unchanged |
(c) Double |
(d) Four times |
What is increased in step-down transformer
|
(a) Voltage |
(b) Current |
(c) Power |
(d) Current density |
Assertion : If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.
Reason : Force is directly proportional to the magnetic field applied.
|
(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 assertion is false but reason is true. |
The focal length of a normal eye-lens is about:
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to . The thickness of lead which will reduce the intensity to
will be
|
(a) 18 mm |
(b) 12 mm |
(c) 6 mm |
(d) 9 mm |