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Physics-

General

Easy

Question

If the $B minus H$ curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?

Both P and Q are suitable for making permanent magnet
P is suitable for making permanent magnet and Q for making electromagnet
P is suitable for making electromagnet and Qis suitable for permanent magnet
Both P and Q are suitable for making electromagnets

The correct answer is: P is suitable for making permanent magnet and Q for making electromagnet

For permanent magnet we prefer a material with high retentivity (so as to make a stronger magnet) and high coercivity (so that magnetization may not be wiped out easily). For electromagnet we prefer high saturated magnetism, low coercivity and least possible area of hysteresis loop so that electromagnet develops high magnetization, is easily demagnetized and energy loss in a magnetization cycle is least. Therefore, Pis suitable for making permanent magnet and Q for making electromagnet.

Related Questions to study

Among the following properties describing diamagnetism identify the property that is wrongly stated

Among the following properties describing diamagnetism identify the property that is wrongly stated

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Permanent magnet has properties retentivity and coercivity respectively

Permanent magnet has properties retentivity and coercivity respectively

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The magnetic susceptibility of a paramagnetic substance at $negative 73 degree$ C is 0.0060, then its value at $negative 173 degree$ C will be

The magnetic susceptibility of a paramagnetic substance at $negative 73 degree$ C is 0.0060, then its value at $negative 173 degree$ C will be

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parallel

If a magnetic substance is kept in a magnetic field then which of the following substance is thrown out?

If a magnetic substance is kept in a magnetic field then which of the following substance is thrown out?

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Curie temperature is the one above which

Curie temperature is the one above which

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Which of the following is represented by the area enclosed by a hysteresis loop (B-H curve)?

Which of the following is represented by the area enclosed by a hysteresis loop (B-H curve)?

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For a paramagnetic material, the dependence of the magnetic susceptibility X on the absolute temperature is given as

For a paramagnetic material, the dependence of the magnetic susceptibility X on the absolute temperature is given as

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Susceptibility of ferromagnetic substance is

Susceptibility of ferromagnetic substance is

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Shape of the graph of position $not stretchy rightwards arrow$ time given in the figure for a body shows that

Shape of the graph of position $not stretchy rightwards arrow$ time given in the figure for a body shows that

parallel

As shown in the figure particle P moves from A to B and particle Q moves from C to D. Displacements for P and Q are and y respectively then

As shown in the figure particle P moves from A to B and particle Q moves from C to D. Displacements for P and Q are and y respectively then

Here is a cube made from twelve wire each of length L, An ant goes from A to G through path A-B-C-G. Calculate the displacement.

Here is a cube made from twelve wire each of length L, An ant goes from A to G through path A-B-C-G. Calculate the displacement.

As shown in the figure a particle starts its motion from 0 to A. And then it moves from. A to B. $Error converting from MathML to accessible text.$ Is an are find the Path length

As shown in the figure a particle starts its motion from 0 to A. And then it moves from. A to B. $Error converting from MathML to accessible text.$ Is an are find the Path length

parallel

Assertion (A): $2 to the power of 4 n end exponent minus 2 to the power of n end exponent left parenthesis 7 n plus 1 right parenthesis$ is divisible by the square of14 where n is a natural number Reason (R): $left parenthesis 1 plus x right parenthesis to the power of n end exponent equals 1 plus to the power of n end exponent C subscript 1 end subscript x plus horizontal ellipsis. plus to the power of n end exponent C subscript n end subscript x to the power of n end exponent for all n element of N$

Assertion (A): $2 to the power of 4 n end exponent minus 2 to the power of n end exponent left parenthesis 7 n plus 1 right parenthesis$ is divisible by the square of14 where n is a natural number Reason (R): $left parenthesis 1 plus x right parenthesis to the power of n end exponent equals 1 plus to the power of n end exponent C subscript 1 end subscript x plus horizontal ellipsis. plus to the power of n end exponent C subscript n end subscript x to the power of n end exponent for all n element of N$

Assertion (A): Number of the dissimilar terms
in the sum of expansion $left parenthesis x plus a right parenthesis to the power of 102 end exponent plus left parenthesis x minus a right parenthesis to the power of 102 end exponent$ is 206
Reason (R): Number of terms in the expansion of $left parenthesis x plus b right parenthesis to the power of n end exponent$ is n+1

Assertion (A): Number of the dissimilar terms
in the sum of expansion $left parenthesis x plus a right parenthesis to the power of 102 end exponent plus left parenthesis x minus a right parenthesis to the power of 102 end exponent$ is 206
Reason (R): Number of terms in the expansion of $left parenthesis x plus b right parenthesis to the power of n end exponent$ is n+1

$I f A equals left parenthesis 300 right parenthesis to the power of 600 end exponent comma$ B=600!, $C equals left parenthesis 200 right parenthesis to the power of 600 end exponent$ then

$I f A equals left parenthesis 300 right parenthesis to the power of 600 end exponent comma$ B=600!, $C equals left parenthesis 200 right parenthesis to the power of 600 end exponent$ then

parallel

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