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Standard VI

Physics

Attraction and Repulsion between Magnets

An aluminium ...

Question

An aluminium ring B faces an electromagnet A. The current $i$ through A can be altered. Then choose the correct options :

i

increases, A will repel B

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i

increases, A will attract B

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i

decreases, A will attract B

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i

decreases, A will repel B

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Solution

The correct options are
A If $i$ increases, A will repel B
C If $i$ decreases, A will attract B
IF $i$ increases, the flux between the two will increase. Therefore by Lenz's law a counter current will be induced such that it opposes the increase in flux .This results in an induced magnetic field that repels original magnetic field of A and hence A and B repel.
IF $i$ decreases, the flux between the two will decrease. Therefore by Lenz's law a counter current will be induced such that it opposes the decrease in flux .This results in an induced magnetic field that is in the same orientation as the original magnetic field of A . And hence A and B attract.

Suggest Corrections

Similar questions

An aluminium ring $B$ faces an
electromagnet $A$ . The current l through A can be altered. Then which of the
following statement is correct?

Q. Two current-conducting wires are hung on a plastic rod. A large current is passed through the two wires in the direction shown.

Statement I: I and II repel each other.
Statement II: I and III repel each other
Statement III: II and III attract each other
Which of the following options is correct regarding this?

A B

is a long wire carrying a current

I_{1}

and

P Q R S

is a rectangular loop carrying currect

I_{2}

(as shown in the figure)
which among the following statements are correct?
(a) Arm

P Q

will get attracted to wire

A B

, and the arm

R S

will get repelled from wire

A B

(b) Arm

P Q

will get repelled from wire

A B

and arm

R S

attracted to wire

A B

P Q

and

R S

will be unequal and opposite
(d) Forces on the arm

P Q

and

R S

will be zero

A square loop of conducting wire is placed near a long straight current carrying wire as shown. Match the statements in column-I with the corresponding results in column-II.

$\begin{matrix} C o l u m n I & C o l u m n I I (a) & I f t h e m a g n i t u d e o f c u r r e n t I & (p) & I n d u c e d c u r r e n t i n i s i n c r e a s e d & t h e l o o p w i l l b e c l o c k w i s e (b) & I f t h e m a g n i t u d e o f c u r r e n t I & (q) & I n d u c e d c u r r e n t i n t h e i s d e c r e a s e d & l o o p w i l l b e a n t i c l o c k w i s e (c) & I f t h e l o o p i s m o v e d & (r) & w i r e w i l l a t t r a c t t h e l o o p a w a y f r o m t h e w i r e (d) & I f t h e l o o p i s m o v e d & (s) & w i r e w i l l r e p e l t h e l o o p (t) & T o r q u e a b o u t c e n t e r o f m a s s o f l o o p i s z e r o d u e t o m a g n e t i c f o r c e \end{matrix}$

I learnt this in atoms and molecules chapter "Two protons will also tend to repel each other because they both have a positive charge. On the other hand, electrons and protons will be attracted to each other because of their unlike charges."but I have a doubt, that is, if protons can attract electrons,then why electrons in the atom is revolving around the protons and not attracting it.

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An aluminium ring B faces an electromagnet A. The current i through A can be altered. Then choose the correct options :

An aluminium ring B faces an electromagnet A. The current $i$ through A can be altered. Then choose the correct options :