A moving coil sensitive galvanometer gives at once much more deflection. To control its speed of deflection
|
(a) A high resistance is to be connected across its terminals |
|
(b) A magnet should be placed near the coil |
|
(c) A small copper wire should be connected across its terminals |
|
(d) The body of galvanometer should be earthed |
(b) A magnet should be placed near the coil
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On adjusting the P-N junction diode in forward biased
|
(a) Depletion layer increases |
(b) Resistance increases |
|
(c) Both decreases |
(d) None of these |
Two long and parallel wires are at a distance of 0.1 m and a current of 5 A is flowing in each of these wires. The force per unit length due to these wires will be
|
(a) 5 |
(b) 5 |
(c) 2.5 |
(d) 2.5 |
A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 
, the charge on it and excess number of electrons on the particle are respectively (g = 
|
(a) 4.8 |
(b) 5.8 |
(c) 3.8 |
(d) 2.8 |
The expression for magnetic induction inside a solenoid of length L carrying a current I and having N number of turns is
|
(a) |
(b) |
(c) |
(d) |
The variation of magnetic susceptibility (x) with magnetising field for a paramagnetic substance is
|
(a)
|
(b)
|
(c)
|
(d)
|
In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be
|
(a) 4 volts |
(b) 4 amperes |
(c) 2 amperes |
(d) 2 volts |
A parallel plate air capacitor has a capacitance of 100 μμF. The plates are at a distance d apart. If a slab of thickness t( t ≤ d) and dielectric constant 5 is introduced between the parallel plates, then the capacitance will be
|
(a) 50 μμF |
(b) 100 μμF |
(c) 200 μμF |
(d) 500 μμF |
