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What are the uses of Electromagnets?
Uses of Electromagnets :
- Electromagnets are used in Motors and Generators.
- Electromagnets are used in Transformers, Pickups and Relays.
- Electromagnets are used in Electronic devices like TV, Computer, Speakers.
- Electromagnets are used in Elevators, Lifts.
- Related Articles
- If \( P A \) and \( P B \) are tangents from an outside point \( P \). such that \( P A=10 \mathrm{~cm} \) and \( \angle A P B=60^{\circ} \). Find the length of chord \( A B \).
- From a point \( P \), two tangents \( P A \) and \( P B \) are drawn to a circle with centre \( O \). If \( O P= \) diameter of the circle, show that \( \Delta A P B \) is equilateral.
- Electromagnets and Their Uses
- Find the value of:(a) \( 4.9 \p 0.07 \)(b) \( 26.4 \p 2.4 \)
- From an external point \( P \), tangents \( P A=P B \) are drawn to a circle with centre \( O \). If \( \angle P A B=50^{\circ} \), then find \( \angle A O B \).
- Two tangent segments \( P A \) and \( P B \) are drawn to a circle with centre \( O \) such that \( \angle A P B=120^{\circ} . \) Prove that \( O P=2 A P \).
- In the figure, there are two concentric circles with centre \( O \) of radii \( 5 \mathrm{~cm} \) and \( 3 \mathrm{~cm} \). From an external point \( P \), tangents \( P A \) and \( P B \) are drawn to these circles. If \( A P=12 \mathrm{~cm} \), find the length of \( B P \)."\n
- The points $A( 4,\ 7) ,\ B( p,\ 3)$ and $C( 7,\ 3)$ are the vertices of a right triangle, right-angled at B, Find the values of $p$.
- From an external point \( P \), tangents \( P A \) and \( P B \) are drawn to a circle with centre \( O \). At one point \( E \) on the circle tangent is drawn, which intersects \( P A \) and \( P B \) at \( C \) and \( D \) respectively. If \( P A=14 \mathrm{~cm} \), find the perimeter of \( \triangle P C D \).
- A point $A( 0,\ 2)$ is equidistant from the points $B( 3,\ p)$ and $C( p,\ 5)$, then find the value of P.
- If $P( 2,p)$ is the mid-point of the line segment joining the points $A( 6,-5)$ and $B( -2,11)$. Find the value of $p$.
- Prove that the points $P( a,\ b+c),\ Q( b,\ c+a)$ and $R( c,\ a+b)$ are Collinear.
- If a point $A (0, 2)$ is equidistant from the points $B (3, p)$ and $C (p, 5)$, then find the value of $p$.
- If the point $A( 0,2)$ is equidistant from the points $B( 3,\ p)$ and $C( p,\ 5)$, find P. Also find the length of AB.
- What should be the value of $p$ if the value of $3x^2 + 4x - p$ is 5, when (a) $x=-1$, (b) $x =1$?
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