In the circuit shown, potential difference between X and Y will be
|
(a) Zero |
(b) 20 V |
(c) 60 V |
(d) 120 V |
In the circuit shown, potential difference between X and Y will be
|
(a) Zero |
(b) 20 V |
(c) 60 V |
(d) 120 V |
(d) 120 V
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Four resistances of 100 W each are connected in the form of square. Then, the effective resistance along the diagonal points is
|
(a) 200 W |
(b) 400 W |
(c) 100 W |
(d) 150 W |
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material denoted by
respectively then
|
(a) |
(b) |
|
(c) |
(d) |
A 50V battery is connected across a 10 ohm resistor. The current is 4.5 amperes. The internal resistance of the battery is
|
(a) Zero |
(b) 0.5 ohm |
(c) 1.1 ohm |
(d) 5.0 ohm |
What determines the hardness of the X-rays obtained from the Coolige tube
|
(a) Current in the filament |
| (b) Pressure of air in the tube |
| (c) Nature of target |
| (d) Potential difference between cathode and target |
The magnetic field at the centre of a circular coil of radius r carrying current I is
. The field at the centre of another coil of radius 2 r carrying same current I is
. The ratio
is
|
(a) |
(b) 1 |
(c) 2 |
(d) 4 |