A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be (Here 
and 
are the currents flowing in the two parts of the circular conductor of radius ‘a’ and 
has the usual meaning)
|
(a) Zero |
(b) |
(c) |
(d) |
(a) Zero
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Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio
|
(a) 1 : 2 |
(b) 1 : 1 |
(c) 2 : 1 |
(d) 1 : 4 |
The vertical component of earth's magnetic field is zero at or The earth's magnetic field always has a vertical component except at the
| (a) Magnetic poles | (b) Geographical poles | (c) Every place | (d) Magnetic equator |
Range of frequencies allotted for commercial FM radio broadcast is
|
(a) 88 to 108 MHz |
(b) 88 to 108 kHz |
(c) 8 to 88 MHz |
(d) 88 to 108 GHz |
