Magnetic Effects of Electric Current - Class 10 - Science
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Back Questions - Magnetic Effects of Electric Current | NCERT | Science | Class 10
Which of the following correctly describes the magnetic field near a long straight wire?
(a) The field consists of straight lines perpendicular to the wire.
(b) The field consists of straight lines parallel to the wire.
(c) The field consists of radial lines originating from the wire.
(d) The field consists of concentric circles centred on the wire.
The correct answer is:
(d) The field consists of concentric circles centred on the wire.
The magnetic field around a long straight wire carrying current forms concentric circles centered on the wire. The direction of the magnetic field lines can be determined by the right-hand rule: if you wrap your right hand around the wire with your thumb pointing in the direction of the current, your fingers will curl in the direction of the magnetic field lines.
At the time of short circuit, the current in the circuit
(a) reduces substantially.
(b) does not change.
(c) increases heavily.
(d) vary continuously.
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Sign up nowState whether the following statements are true or false.
(a) The field at the centre of a long circular coil carrying current will be parallel straight lines.
(b) A wire with a green insulation is usually the live wire of an electric supply.
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Sign up nowList two methods of producing magnetic fields.
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Sign up nowWhen is the force experienced by a current–carrying conductor placed in a magnetic field largest?
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Sign up nowImagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?
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Sign up nowState the rule to determine the direction of a
(i) magnetic field produced around a straight conductor-carrying current,
(ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and
(iii) current induced in a coil due to its rotation in a magnetic field.
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Sign up nowWhen does an electric short circuit occur?
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Sign up nowWhat is the function of an earth wire? Why is it necessary to earth metallic appliances?
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Sign up nowExtra Questions - Magnetic Effects of Electric Current | NCERT | Science | Class 10
A vertical conducting ring of radius $R$ falls vertically under gravity in a horizontal magnetic field of magnitude $B_{0}$. The direction of $B_{0}$ is perpendicular to the plane of the ring. When the speed of the ring becomes $v$:
A. Points $C$ and $D$ are at the same potential.
B. Points $A$ and $B$ are at the same potential.
C. Time to gain speed $v$ is more than $\frac{v}{g}$.
D. No current flows in the ring.
The correct options are: A. Points $C$ and $D$ are at the same potential. C. Time to gain speed $v$ is more than $\frac{v}{g}$
Explanation for option A: Since the induced electromotive force (EMF) depends on the change in magnetic flux through the loop, and the motion is purely vertical, Points $C$ and $D$ align horizontally and do not experience any differential magnetic field or motion-related change in flux across them. This means there is no induced EMF between these points, leaving them at the same electrical potential.
Explanation for option C: The presence of a horizontal magnetic field $B_0$ and a vertical velocity $v$ of the ring induces an EMF across points $A$ and $B$ (diametrically opposite on the ring), which is calculated as $Bv\ell$, where $\ell$ is the component of the ring's circumference parallel to $B_0$. Because of this EMF, a current flows which leads to charge accumulation and a Lorentz force opposing the motion (upwards). The opposing force effectively reduces the net downward acceleration of the ring from pure gravity $g$ to something less. Consequently, the ring takes longer to reach the speed $v$ than it would under gravity alone, hence the time required is greater than $\frac{v}{g}$.
State the rule to determine the direction of a
(i) magnetic field produced around a straight conductor carrying current.
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Sign up nowWhich of the following is true about current-carrying conductors?
A) They behave as magnets always.
B) A coil of the current-carrying conductor behaves like a magnet.
C) They can never behave as a magnet.
D) A current-carrying conductor is always attracted to a magnet.
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Sign up nowA bar magnet has coercivity $4 \times 10^{3} \mathrm{Am}^{-1}$. It is desired to demagnetize it by inserting it inside a solenoid $12 \mathrm{~cm}$ long and having 60 turns. The current that should be sent through the solenoid is
A) $2 \mathrm{~A}$
B) $4 \mathrm{~A}$
C) $6 \mathrm{~A}$
D) $8 \mathrm{~A}$
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Sign up nowA coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. When a current I passes through the coil, the magnetic field at the centre is
A) $\frac{\mu_{0} \mathrm{NI}}{b}$
B) $\frac{2 \mu_{0} \mathrm{NI}}{a}$
C) $\frac{\mu_{0} \mathrm{NI}}{2(b-a)} \ln \frac{b}{a}$
D) $\frac{\mu_{0} \mathrm{N}}{2(b-a)} \ln \frac{b}{a}$
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