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# Magnetic Effects of Electric Current

10th Class - CBSE - Physics - 1483 Questions - 0 Concepts

#### Important Questions

Q1 Single Correct Hard
The correct plot of the magnitude of magnetic field $\bar{B}$ vs distance r from centre of the wire is, if the radius of wire is R
• A. • B. • C. • D. Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q2 Single Correct Hard
A current carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lies in the $y-z$ plane.
• A. The magnetic moment does not change.
• B. The magnitude of $\bar B$ at $(0,0, z), z$>>R increases.
• C. The magnitude of $\bar B$ at $(0, 0, z), z$>>R is unchanged.
• D. The magnitude of magnetic moment now diminishes.

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q3 One Word Hard
A long straight wire is coplanar with a current carrying circular loop of radius $R$ as shown in figure. Current flowing through wire and the loop is ${I}_{0}$ and ${I}_{1}$ respectively. the distance between center of loop and wire is $r=2R$. If force of attraction between the wire and the loop is $F={ \mu }_{ 0 }{ I }_{ 0 }I\left( \cfrac { X-\sqrt { 3 } }{ \sqrt { 3 } } \right)$. Find X?

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q4 One Word Hard
A long straight wire is coplanar with a current carrying circular loop of radius $R$ as shown in figure. Current flowing through wire and the loop is ${I}_{0}$ and ${I}_{1}$ respectively. the distance between center of loop and wire is $r=2R$. If force of attraction between the wire and the loop is $F={ \mu }_{ 0 }{ I }_{ 0 }I\left( \cfrac { X-\sqrt { 3 } }{ \sqrt { 3 } } \right)$. Find X?

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q5 Single Correct Hard

Five long wires A, B, C, D and E each carrying I are arranged to form edges of a pentagonal prism as shown in figure. Each wire carries current out of the plane of paper, the magnetic induction at a point on the axis O is (axis O is at a distance R from each wire) is then
• A. less than zero
• B. more than zero
• C. infinite
• D. equal to zero

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q6 Subjective Hard
What is the Si unit of magnetic flux, is it vector or scalar quantity?

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q7 Single Correct Hard
A rectangular loop of sides $10$cm and $5$cm carrying a current I of $12$A is placed in different orientations as shown in the figure.
If there is a uniform magnetic field of $0.3$T in the positive z-direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium.
• A. $(2)$ and $(3)$, respectively
• B. $(1)$ and $(2)$, respectively
• C. $(1)$ and $(3)$, respectively
• D. $(2)$ and $(4)$, respectively

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q8 Single Correct Hard
A tiny bar magnet is kept close to a long current carrying straight wire placed along the z axis. When the center of the magnet is at (a, 0.0) and it is oriented along the z axis, it experiences
• A. neither net force nor net torque.
• B. both a net force and a net torque.
• C. a net force but no net torque.
• D. no net force but a net torque.

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q9 One Word Hard
The lateral surface of a long straight solenoid with $n$ turns per unit length experiences a pressure of $\displaystyle p=\frac{1}{x}\mu_0n^2I^2$ when a current $I$ flows through it. Find $x$.

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Q10 Single Correct Hard
A magnetizing field of 1600A/m producers a magnetic flux of 2 x $10^{-5}$ Wb in a bar of iron of cross section 0.2 x $10^{-4}m^2$. Calculate the susceptibility of the bar.
• A. 288.9
• B. 2
• C. 1328
• D. 596.8

Asked in: Physics - Magnetic Effects of Electric Current

1 Verified Answer | Published on 07th 09, 2020

Questions 122475
Subjects 10
Chapters 93
Enrolled Students 65