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Physics-

General

Easy

Question

What is increased in step-down transformer

Voltage
Current
Power
Current density

The correct answer is: Current

We know that for step down transformer
$V subscript p end subscript greater than V subscript s end subscript$ but $fraction numerator V subscript p end subscript over denominator V subscript s end subscript end fraction equals fraction numerator i subscript s end subscript over denominator i subscript p end subscript end fraction rightwards double arrow i subscript s end subscript greater than i subscript p end subscript$
Current in the secondary coil is greater than the primary

Related Questions to study

Fleming’s left and right hand rule are used in

Fleming’s left and right hand rule are used in

Physics-General

There are two solenoids of same length and inductance L but their diameters differ to the extent that one can just fit into the other. They are connected in three different ways in series. (1) They are connected in series but separated by large distance, (2) they are connected in series with one inside the other and senses of the turns coinciding, (3) both are connected in series with one inside the other with senses of the turns opposite as depicted in figures 1, 2 and 3 respectively. The total inductance of the solenoids in each of the case 1, 2 and 3 are respectively

There are two solenoids of same length and inductance L but their diameters differ to the extent that one can just fit into the other. They are connected in three different ways in series. (1) They are connected in series but separated by large distance, (2) they are connected in series with one inside the other and senses of the turns coinciding, (3) both are connected in series with one inside the other with senses of the turns opposite as depicted in figures 1, 2 and 3 respectively. The total inductance of the solenoids in each of the case 1, 2 and 3 are respectively
Physics-General

The two tangents to the curve $a x to the power of 2 end exponent plus 2 h x y plus b y to the power of 2 end exponent equals 1 comma blank a greater than 0$ at the points where it crosses $x$ -axis, are

The two tangents to the curve $a x to the power of 2 end exponent plus 2 h x y plus b y to the power of 2 end exponent equals 1 comma blank a greater than 0$ at the points where it crosses $x$ -axis, are

parallel

A circular metal plate is heated so that its radius increases at a rate of 0.1 mm per minute. Then the rate at which the plate’s area is increasing when the radius is 50 cm is

A circular metal plate is heated so that its radius increases at a rate of 0.1 mm per minute. Then the rate at which the plate’s area is increasing when the radius is 50 cm is

Any tangent to the curve $y equals 2 x to the power of 5 end exponent plus 4 x to the power of 3 end exponent plus 7 x plus 9$

Any tangent to the curve $y equals 2 x to the power of 5 end exponent plus 4 x to the power of 3 end exponent plus 7 x plus 9$

If $S T$ and $S N$ are the lengths of the subtangent and the subnormal at the point $theta equals fraction numerator pi over denominator 2 end fraction$ on the curve $x equals a open parentheses theta plus sin invisible function application theta close parentheses comma blank y equals a open parentheses 1 minus cos invisible function application theta close parentheses comma blank a not equal to 1$ , then

If $S T$ and $S N$ are the lengths of the subtangent and the subnormal at the point $theta equals fraction numerator pi over denominator 2 end fraction$ on the curve $x equals a open parentheses theta plus sin invisible function application theta close parentheses comma blank y equals a open parentheses 1 minus cos invisible function application theta close parentheses comma blank a not equal to 1$ , then

parallel

The tangent to the curve $y equals x to the power of 3 end exponent minus 6 x to the power of 2 end exponent plus 9 x plus 4 comma blank 0 less or equal than x less or equal than 5$ has maximum slope at $x$ which is equal to

The tangent to the curve $y equals x to the power of 3 end exponent minus 6 x to the power of 2 end exponent plus 9 x plus 4 comma blank 0 less or equal than x less or equal than 5$ has maximum slope at $x$ which is equal to

The line $left parenthesis x divided by a right parenthesis plus left parenthesis y divided by b right parenthesis equals 2$ , touches the curve $fraction numerator x to the power of n end exponent over denominator a to the power of n end exponent end fraction plus fraction numerator y to the power of n end exponent over denominator b to the power of n end exponent end fraction equals 2$ , at

The line $left parenthesis x divided by a right parenthesis plus left parenthesis y divided by b right parenthesis equals 2$ , touches the curve $fraction numerator x to the power of n end exponent over denominator a to the power of n end exponent end fraction plus fraction numerator y to the power of n end exponent over denominator b to the power of n end exponent end fraction equals 2$ , at

The length of the subtangent to the curve $x to the power of 2 end exponent plus x y plus y to the power of 2 end exponent equals 7$ at $left parenthesis 1 comma blank minus 3 right parenthesis$ is

The length of the subtangent to the curve $x to the power of 2 end exponent plus x y plus y to the power of 2 end exponent equals 7$ at $left parenthesis 1 comma blank minus 3 right parenthesis$ is

parallel

The equation of the tangent to the curve $x equals 2 cos to the power of 3 end exponent invisible function application theta$ and $y equals 3 sin to the power of 3 end exponent invisible function application theta$ at the point, $theta equals pi divided by 4$ is

The equation of the tangent to the curve $x equals 2 cos to the power of 3 end exponent invisible function application theta$ and $y equals 3 sin to the power of 3 end exponent invisible function application theta$ at the point, $theta equals pi divided by 4$ is

If $f open parentheses x close parentheses equals fraction numerator 1 over denominator x plus 1 end fraction minus log invisible function application left parenthesis 1 plus x right parenthesis comma blank x greater than 0$ , then $f$ is

If $f open parentheses x close parentheses equals fraction numerator 1 over denominator x plus 1 end fraction minus log invisible function application left parenthesis 1 plus x right parenthesis comma blank x greater than 0$ , then $f$ is

Let $P left parenthesis 2 comma blank 2 right parenthesis$ and $Q left parenthesis 1 divided by 2 comma blank minus 1 right parenthesis$ be two points on the parabola $y to the power of 2 end exponent equals 2 x$ . The coordinates of the point $R$ on the parabola $y to the power of 2 end exponent equals 2 x$ , where the tangent to the curve is parallel to the chord $P Q$ , are

Let $P left parenthesis 2 comma blank 2 right parenthesis$ and $Q left parenthesis 1 divided by 2 comma blank minus 1 right parenthesis$ be two points on the parabola $y to the power of 2 end exponent equals 2 x$ . The coordinates of the point $R$ on the parabola $y to the power of 2 end exponent equals 2 x$ , where the tangent to the curve is parallel to the chord $P Q$ , are

parallel

The sum and difference of two perpendicular vectors of equal length are

The sum and difference of two perpendicular vectors of equal length are

If a current of $5 blank A$ in a coil of self inductance $2 blank m H$ is cut off in time $0.1 blank s$ , the induced $e m f$ in the coil is

If a current of $5 blank A$ in a coil of self inductance $2 blank m H$ is cut off in time $0.1 blank s$ , the induced $e m f$ in the coil is

Physics-General

A coil having an area $2 m to the power of 2 end exponent$ is placed in a magnetic field which changes from $1 W b divided by m to the power of 2 end exponent$ to $4 W b divided by m to the power of 2 end exponent$ in an interval of $2 blank s e c o n d$ . The e.m.f. induced in the coil will be

A coil having an area $2 m to the power of 2 end exponent$ is placed in a magnetic field which changes from $1 W b divided by m to the power of 2 end exponent$ to $4 W b divided by m to the power of 2 end exponent$ in an interval of $2 blank s e c o n d$ . The e.m.f. induced in the coil will be

Physics-General

parallel

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