Current provided by a battery is maximum when
|
(a) Internal resistance equal to external resistance |
|
(b) Internal resistance is greater than external resistance |
|
(c) Internal resistance is less than external resistance |
|
(d) None of these |
(a) Internal resistance equal to external resistance
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A hollow metallic sphere of radius R is given a charge Q. Then the potential at the centre is
|
(a) Zero |
(b) |
(c) |
(d) |
An L-R circuit has a cell of e.m.f. E, which is switched on at time t = 0. The current in the circuit after a long time will be
|
(a) Zero |
(b) |
(c) |
(d) |
The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (i) just after the switch is closed and (ii) a long time later, greatest first
|
(a) (i) |
|
(b) (i) |
|
(c) (i) |
|
(d) (i) |
The relation between Ip and Vp for a triode is 
, Keeping the grid potential constant at 1V, the value of rp will be
|
(a) 8 kW |
(b) 4 kW |
(c) 2 kW |
(d) 8 kW |
The ratio of thermionic currents (I/I0) for a metal when the temperature is slowly increased 
to T as shown in figure. (I and I0 are currents at T and respectively). Then which one is correct?
| (a) A | (b) B | (c) C | (d) D |
and 
are point charges located at points as shown in the figure and S is a spherical Gaussian surface of radius R. Which of the following is true according to the Gauss’s law
|
(a) |
|
(b) |
|
(c) |
|
(d) None of the above |
