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Physics-

General

Easy

Question

Self-inductance of a coil is $50 blank m H$ . A current of $1 blank A$ passing through the coil reduces to zero at steady rate in $0.1 blank s e c$ ., the self-induced $e m f$ is

5 volts
0.05 volts
50 volts
0.5 volts

The correct answer is: 0.5 volts

$L equals 50 cross times 10 to the power of negative 3 end exponent H$
$fraction numerator d I over denominator d t end fraction equals fraction numerator left parenthesis 1 minus 0 right parenthesis over denominator 0.1 end fraction equals 10$
$epsilon equals fraction numerator L. d I over denominator d t end fraction equals 50 cross times 10 to the power of negative 3 end exponent cross times 10 equals 50 cross times 10 to the power of negative 2 end exponent equals 0.5 blank v o l t$

Related Questions to study

A magnetic field of $2 cross times 10 to the power of negative 2 end exponent T$ acts at right angles to a coil of area $100 blank c m to the power of 2 end exponent$ with 50 turns. The average emf induced in the coil is $0.1 blank V$ , when it is removed from the field in time $T$ . The value of $t$ is

A magnetic field of $2 cross times 10 to the power of negative 2 end exponent T$ acts at right angles to a coil of area $100 blank c m to the power of 2 end exponent$ with 50 turns. The average emf induced in the coil is $0.1 blank V$ , when it is removed from the field in time $T$ . The value of $t$ is

Physics-General

The variation of induced emf $left parenthesis epsilon right parenthesis$ with time (t ) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

The variation of induced emf $left parenthesis epsilon right parenthesis$ with time (t ) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as
Physics-General

A copper ring having a cut such as not to form a complete loop is held horizontally ad a bar magnet is dropped through the ring with its length along the axis of the ring, figure. The acceleration of the falling magnet is

A copper ring having a cut such as not to form a complete loop is held horizontally ad a bar magnet is dropped through the ring with its length along the axis of the ring, figure. The acceleration of the falling magnet is
Physics-General

parallel

For previous objective, which of the following graphs is correct

For previous objective, which of the following graphs is correct

Physics-General

If in a triangle $comma blank open parentheses 1 minus fraction numerator r subscript 1 end subscript over denominator r subscript 2 end subscript end fraction close parentheses open parentheses 1 minus fraction numerator r subscript 1 end subscript over denominator r subscript 3 end subscript end fraction close parentheses equals 2 comma blank$ then the triangle is

If in a triangle $comma blank open parentheses 1 minus fraction numerator r subscript 1 end subscript over denominator r subscript 2 end subscript end fraction close parentheses open parentheses 1 minus fraction numerator r subscript 1 end subscript over denominator r subscript 3 end subscript end fraction close parentheses equals 2 comma blank$ then the triangle is

$I f sin to the power of negative 1 end exponent invisible function application a plus sin to the power of negative 1 end exponent invisible function application b plus sin to the power of negative 1 end exponent invisible function application c equals pi$ , then $blank a square root of 1 minus a to the power of 2 end exponent end root plus b square root of 1 minus b to the power of 2 end exponent end root plus c square root of 1 minus c to the power of 2 end exponent end root$ is equal to

$I f sin to the power of negative 1 end exponent invisible function application a plus sin to the power of negative 1 end exponent invisible function application b plus sin to the power of negative 1 end exponent invisible function application c equals pi$ , then $blank a square root of 1 minus a to the power of 2 end exponent end root plus b square root of 1 minus b to the power of 2 end exponent end root plus c square root of 1 minus c to the power of 2 end exponent end root$ is equal to

parallel

The side of triangle $A B C$ are in A.P. (order being $a comma blank b comma blank c$ ) and satisfy $fraction numerator 2 factorial over denominator 1 factorial 9 factorial end fraction plus fraction numerator 2 factorial over denominator 3 factorial 7 factorial end fraction plus fraction numerator 1 over denominator 5 factorial 5 factorial end fraction equals fraction numerator 8 to the power of a end exponent over denominator open parentheses 2 b close parentheses factorial blank end fraction comma blank$ then the value of $cos invisible function application A plus cos invisible function application B$ is

The side of triangle $A B C$ are in A.P. (order being $a comma blank b comma blank c$ ) and satisfy $fraction numerator 2 factorial over denominator 1 factorial 9 factorial end fraction plus fraction numerator 2 factorial over denominator 3 factorial 7 factorial end fraction plus fraction numerator 1 over denominator 5 factorial 5 factorial end fraction equals fraction numerator 8 to the power of a end exponent over denominator open parentheses 2 b close parentheses factorial blank end fraction comma blank$ then the value of $cos invisible function application A plus cos invisible function application B$ is

One of the general solutions of $4 sin invisible function application theta sin invisible function application 2 theta sin invisible function application 4 theta equals sin invisible function application 3 theta$ is

One of the general solutions of $4 sin invisible function application theta sin invisible function application 2 theta sin invisible function application 4 theta equals sin invisible function application 3 theta$ is

Which of the following is correct?

Which of the following is correct?

parallel

The number of solutions of $sec to the power of 2 end exponent invisible function application theta plus c o s e c to the power of 2 end exponent theta plus 2 blank c o s e c to the power of 2 end exponent theta equals 8 comma blank 0 less or equal than theta less or equal than pi divided by 2$ is

The number of solutions of $sec to the power of 2 end exponent invisible function application theta plus c o s e c to the power of 2 end exponent theta plus 2 blank c o s e c to the power of 2 end exponent theta equals 8 comma blank 0 less or equal than theta less or equal than pi divided by 2$ is

$I f sin invisible function application 2 theta equals cos invisible function application 3 theta blank a n d blank theta$ is an acute angle, then $sin invisible function application theta$ equals

$I f sin invisible function application 2 theta equals cos invisible function application 3 theta blank a n d blank theta$ is an acute angle, then $sin invisible function application theta$ equals

If $cos invisible function application B cos invisible function application C plus sin invisible function application B sin invisible function application C sin to the power of 2 end exponent invisible function application A equals 1 comma$ then triangle $A B C$ is

If $cos invisible function application B cos invisible function application C plus sin invisible function application B sin invisible function application C sin to the power of 2 end exponent invisible function application A equals 1 comma$ then triangle $A B C$ is

parallel

The number of values of $theta$ which satisfy the equation $sin invisible function application 3 theta minus sin invisible function application theta equals 4 cos to the power of 2 end exponent invisible function application theta minus 2 comma blank for all blank theta element of open square brackets 0 comma blank 2 pi close square brackets comma$ is

The number of values of $theta$ which satisfy the equation $sin invisible function application 3 theta minus sin invisible function application theta equals 4 cos to the power of 2 end exponent invisible function application theta minus 2 comma blank for all blank theta element of open square brackets 0 comma blank 2 pi close square brackets comma$ is

The general solution of the trigonometric equation $sin invisible function application x plus cos invisible function application x equals 1$ is given by

The general solution of the trigonometric equation $sin invisible function application x plus cos invisible function application x equals 1$ is given by

12 guests at a dinner party are to be seated along a circular table. Supposing that the master and mistress of the house have fixed seats opposite one another, and that there are two specified guests who must always, be placed next to one another, the number of ways in which the company can be placed, is-

12 guests at a dinner party are to be seated along a circular table. Supposing that the master and mistress of the house have fixed seats opposite one another, and that there are two specified guests who must always, be placed next to one another, the number of ways in which the company can be placed, is-

parallel

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