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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.

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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.

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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?

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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?

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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

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

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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

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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.

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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 $$x$$.

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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

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