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Physics-

General

Easy

Question

The current passing through a choke coil of 5 henry is decreasing at the rate of $2 blank a m p e r e divided by s e c$ . The e.m.f. developing across the coil is

$10 V$
$- 10 V$
$2.5 V$
$- 2.5 V$

The correct answer is: $10 blank V$

Given $fraction numerator d i over denominator d t end fraction equals 2 A divided by s e c. comma L equals 5 blank H blank therefore e equals L fraction numerator d i over denominator d t end fraction equals 5 cross times 2 equals 10 blank V$

Related Questions to study

The energy stored in an inductor of self inductance $L$ henry carrying a current of 1 A is

The energy stored in an inductor of self inductance $L$ henry carrying a current of 1 A is

Physics-General

If $tan invisible function application open parentheses A minus B close parentheses equals 1$ and $sec invisible function application open parentheses A plus B close parentheses equals 2 divided by square root of 3 comma blank$ then the smallest positive values of $A blank$ and $B comma$ respectively, are

If $tan invisible function application open parentheses A minus B close parentheses equals 1$ and $sec invisible function application open parentheses A plus B close parentheses equals 2 divided by square root of 3 comma blank$ then the smallest positive values of $A blank$ and $B comma$ respectively, are

Let $n$ be a positive integer such that $sin invisible function application fraction numerator pi over denominator 2 n end fraction plus cos invisible function application fraction numerator pi over denominator 2 n end fraction equals fraction numerator square root of x over denominator 2 end fraction.$ Then

Let $n$ be a positive integer such that $sin invisible function application fraction numerator pi over denominator 2 n end fraction plus cos invisible function application fraction numerator pi over denominator 2 n end fraction equals fraction numerator square root of x over denominator 2 end fraction.$ Then

parallel

In triangle $A B C comma$ if $sin invisible function application A cos invisible function application B equals fraction numerator 1 over denominator 4 end fraction$ and $blank 3 tan invisible function application A equals tan invisible function application B$ , then $cot to the power of 2 end exponent invisible function application A$ is equal to

In triangle $A B C comma$ if $sin invisible function application A cos invisible function application B equals fraction numerator 1 over denominator 4 end fraction$ and $blank 3 tan invisible function application A equals tan invisible function application B$ , then $cot to the power of 2 end exponent invisible function application A$ is equal to

If $y equals open parentheses 1 plus tan invisible function application A close parentheses open parentheses 1 minus tan invisible function application B close parentheses blank$ where $blank A minus B equals fraction numerator pi over denominator 4 end fraction comma$ then $open parentheses y plus 1 close parentheses to the power of y plus 1 end exponent blank$ is equal to

If $y equals open parentheses 1 plus tan invisible function application A close parentheses open parentheses 1 minus tan invisible function application B close parentheses blank$ where $blank A minus B equals fraction numerator pi over denominator 4 end fraction comma$ then $open parentheses y plus 1 close parentheses to the power of y plus 1 end exponent blank$ is equal to

The number of solutions of $sin invisible function application x plus sin invisible function application 2 x plus sin invisible function application 3 x equals cos invisible function application x plus cos invisible function application 2 x plus cos invisible function application 3 x comma blank 0 less or equal than x less or equal than 2 pi comma$ is

The number of solutions of $sin invisible function application x plus sin invisible function application 2 x plus sin invisible function application 3 x equals cos invisible function application x plus cos invisible function application 2 x plus cos invisible function application 3 x comma blank 0 less or equal than x less or equal than 2 pi comma$ is

parallel

In a set of teachers of a school, two teachers are said to be related if they “teach the same subject”, then the relation is

In a set of teachers of a school, two teachers are said to be related if they “teach the same subject”, then the relation is

If $A equals open curly brackets 13 comma 57 comma 911131517 close curly brackets comma B equals left curly bracket 24 horizontal ellipsis comma 18 right curly bracket$ and $N$ is the universal set, then $A ´ union left parenthesis left parenthesis A union B right parenthesis intersection B ´ right parenthesis$ is

If $A equals open curly brackets 13 comma 57 comma 911131517 close curly brackets comma B equals left curly bracket 24 horizontal ellipsis comma 18 right curly bracket$ and $N$ is the universal set, then $A ´ union left parenthesis left parenthesis A union B right parenthesis intersection B ´ right parenthesis$ is

In the set $A equals open curly brackets 1 comma blank 2 comma blank 3 comma blank 4 comma blank 5 close curly brackets comma$ a relation $R$ is defined by $R equals open curly brackets open parentheses x comma y close parentheses colon x comma y element of A blank a n d blank x less than y close curly brackets.$ Then, $R$ is

In the set $A equals open curly brackets 1 comma blank 2 comma blank 3 comma blank 4 comma blank 5 close curly brackets comma$ a relation $R$ is defined by $R equals open curly brackets open parentheses x comma y close parentheses colon x comma y element of A blank a n d blank x less than y close curly brackets.$ Then, $R$ is

parallel

Consider the set $A$ of all determinants of order 3 with entries 0 or 1 only. Let $B$ be the subset of $A$ consisting of all determinants with value 1. Let C be the subset of the set of all determinants with value $negative 1.$ Then

Consider the set $A$ of all determinants of order 3 with entries 0 or 1 only. Let $B$ be the subset of $A$ consisting of all determinants with value 1. Let C be the subset of the set of all determinants with value $negative 1.$ Then

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Three sets $A comma blank B comma blank C$ are such that $A equals B intersection C$ and $B equals C intersection A$ , then

Three sets $A comma blank B comma blank C$ are such that $A equals B intersection C$ and $B equals C intersection A$ , then

parallel

Which one of the following relations on $R$ is an equivalence relation?

Which one of the following relations on $R$ is an equivalence relation?

If $R$ is a relation from a finite set $A$ having $m$ elements to a finite set $B$ having $n$ elements, then the number of relations from $A$ to $B$ is

If $R$ is a relation from a finite set $A$ having $m$ elements to a finite set $B$ having $n$ elements, then the number of relations from $A$ to $B$ is

If $X equals left curly bracket 4 to the power of n end exponent minus 3 n minus 1 blank colon n element of N right curly bracket$ and $Y equals open curly brackets 9 open parentheses n minus 1 close parentheses colon n element of N close curly brackets comma$ then $X union Y$ is equal to

If $X equals left curly bracket 4 to the power of n end exponent minus 3 n minus 1 blank colon n element of N right curly bracket$ and $Y equals open curly brackets 9 open parentheses n minus 1 close parentheses colon n element of N close curly brackets comma$ then $X union Y$ is equal to

parallel

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