Physics-
General
Easy
Question
A small piece of metal wire is dragged across the gap between the poles of a magnet in 0.4 s. If change in magnetic flux in the wire is 
Wb, then emf induced in the wire is
The correct answer is:
Related Questions to study
Physics-
A coil of wire of a certain radius has 600 turns and a self inductanceof 
. The self inductance of a 2nd similar coil of 500 turns will be
A coil of wire of a certain radius has 600 turns and a self inductanceof . The self inductance of a 2nd similar coil of 500 turns will be
Physics-General
Physics-
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
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
Physics-General
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
