Physics-
General
Easy
Question
If a current of 
flows in one second through a coil, and the induced e.m.f. is 
, then the self-inductance of the coil is
The correct answer is:
Related Questions to study
Physics-
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device is
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device is
Physics-General
General
If 
and 
then x
If and then x
GeneralGeneral
Maths-
Let a, b, c be distinct non-negative numbers. If the vectors ai + aj + ck, i + k and ci + cj + bk lie in a plane, then c is -
Let a, b, c be distinct non-negative numbers. If the vectors ai + aj + ck, i + k and ci + cj + bk lie in a plane, then c is -
Maths-General
Maths-
Let a, b and c be three non-coplanar vectors, and let p, q and r be the vectors defined by the relations p = 
. q = 
and r = 
Then the value of the expression (a + b).p + (c + a).r is equal to -
Let a, b and c be three non-coplanar vectors, and let p, q and r be the vectors defined by the relations p = . q = and r = Then the value of the expression (a + b).p + (c + a).r is equal to -
Maths-General
Maths-
The vectors c, directed along the internal bisector of the angle between the vectors a = 7i – 4j – 4k and b = – 2i – j + 2k , with |c| = 5 
is -
The vectors c, directed along the internal bisector of the angle between the vectors a = 7i – 4j – 4k and b = – 2i – j + 2k , with |c| = 5 is -
Maths-General
Maths-
Volume of tetrahedron whose vertices one A (3, 7, 4) B (5, – 2, 3) C (–4, 5, 6) and D (1, 2, 3) are -
Volume of tetrahedron whose vertices one A (3, 7, 4) B (5, – 2, 3) C (–4, 5, 6) and D (1, 2, 3) are -
Maths-General
Maths-
PQRSTU is Regular hexagon. Then 
+ 
+ 
+ 
=
PQRSTU is Regular hexagon. Then + + + =
Maths-General
Maths-
I): If AD, BE, CF are the medians of a ABC, then 
+ 
+ 
= 
,II): If G is the Centroid of the ABC, then 
+ 
+ 
= ,Which of the above statements is correct ?
I): If AD, BE, CF are the medians of a ABC, then + + = ,II): If G is the Centroid of the ABC, then + + = ,Which of the above statements is correct ?Maths-General
Maths-General
Maths-
I : If[
] = 2, then the volume of the Parallelopiped whose coterminous edges are 
, 
and 
is 18 cubic units.,II : If 
+ 
+ 
, + 
+ 
are coplanar Vectors then the value of 'a' is 
.,Which of the above statements is correct ?
I : If[] = 2, then the volume of the Parallelopiped whose coterminous edges are , and is 18 cubic units.,II : If + + , + + are coplanar Vectors then the value of 'a' is .,Which of the above statements is correct ?
Maths-General
Maths-
I : If , 
, are three mutually perpendicular Unit Vectors then | + + | = 3.,II. If the sum of two Unit Vectors is a Unit Vectors then | – | = 
.,Which of the above statements is correct ?
I : If , , are three mutually perpendicular Unit Vectors then | + + | = 3.,II. If the sum of two Unit Vectors is a Unit Vectors then | – | = .,Which of the above statements is correct ?
Maths-General
Maths-
× 
+ × 
+ × ( × ) =
× + × + × ( × ) =
Maths-General
Maths-
= 4i + j + 3k, = i + 3j + 2k, = 2i + 7k then the points represented by the position vectors are -
= 4i + j + 3k, = i + 3j + 2k, = 2i + 7k then the points represented by the position vectors are -
Maths-General
General
then x
then x
GeneralGeneral
Physics-
A point P moves in counter-clockwise direction on a circular path as shown in the figure. The movement of P is such that it sweeps out length 
where 
is in metre and t is in second. The radius of the path is 20 m. The acceleration of P when t =2s is nearly
A point P moves in counter-clockwise direction on a circular path as shown in the figure. The movement of P is such that it sweeps out length where is in metre and t is in second. The radius of the path is 20 m. The acceleration of P when t =2s is nearlyPhysics-General
Physics-General
Physics-
The string of pendulum of length 
is displaced through 
from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is
The string of pendulum of length is displaced through from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is
Physics-General
