A parallel plate capacitor with air as medium between the plates has a capacitance of 10 μF. The area of capacitor is divided into two equal halves and filled with two media as shown in the figure having dielectric constant 
and 
. The capacitance of the system will now be
|
(a) 10 μF |
(b) 20 μF |
(c) 30 μF |
(d) 40 μF |
(c) 30 μF
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In a Young’s double slit experiment, the slit separation is 1 mm and the screen is 1 m from the slit. For a monochromatic light of wavelength 500 nm, the distance of 3rd minima from the central maxima is
|
(a) 0.50 mm |
(b) 1.25 mm |
(c) 1.50 mm |
(d) 1.75 mm |
In a transistor circuit shown here the base current is 35 mA. The value of the resistor Rb is
| (a) 123.5 kW | (b) 257 kW | (c) 380.05 kW | (d) None of these |
Assertion : Television signals are received through sky-wave propagation.
Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.
|
(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. |
A magnet of magnetic moment 50 
is placed along the x-axis in a magnetic field 
T. The torque acting on the magnet is
|
(a) 175 |
(b) 150 |
(c) 75 |
(d) 25 |
