WBJEE · Physics · Magnetic Effects of Current
An electric current \(^{\prime} I^{\prime}\) enters and leaves a uniform circular wire of radius \(r\) through diametrically opposite points. A particle carrying a charge \(q\) moves along the axis of the circular wire with speed \(v\). What is the magnetic force experienced by the particle when it passes through the centre of the circle?
- A \(q v \frac{\mu_{0} i}{a}\)
- B \(q v \frac{\mu_{0} i}{2 a}\)
- C \(q v \frac{\mu_{0} i}{2 \pi a}\)
- D Zero
Answer & Solution
Correct Answer
(D) Zero
Step-by-step Solution
Detailed explanation
Given, electric current in circular wire \(=I\) Radius of wire \(=r\) Charge on particle \(=q\) Speed of the particle \(=v\) The given loop can be as shown in the figure below. \(1 / 2\) \(\because\) Net magnetic field at the centre \(=0\) So, magnetic force…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- The length of a metal wire is \(L_{1}\) when the tension is \(T_{1}\) and \(L_{2}\) when the tension is \(T_{2}\) The unstretched length of wire isWBJEE 2015 Medium
- The radius of the light circle observed by a fish at a depth of 12 meter is (refractive index of water \(=4 / 3\) )WBJEE 2010 Medium
- \(\vec{A}\) and \(\vec{B}\) are two vectors given by \(\vec{A}=2 \hat{i}+3 \hat{j}\) and \(\vec{B}=\hat{i}+\hat{j}\). The magnitude of the component of \(\vec{A}\) along \(\vec{B}\) isWBJEE 2009 Medium
- A straight wire of length \(2 \mathrm{m}\) carries a current of \(10 \mathrm{A}\). If this wire is placed in a uniform magnetic field of 0.15 T making an angle of \(45^{\circ}\) with the magnetic field, the applied force on the wire will beWBJEE 2012 Easy
- A circular loop of radius \(r\) of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field
\(B\) at its centre. If instead, a circular loep of radius \(2 r,\) made of same material, having the same cross-section is connected to the same voltage source, what will be the magnetic ficld at its centre?WBJEE 2018 Medium - Given \(\overrightarrow{\mathrm{C}}=\overrightarrow{\mathrm{A}} \times \overrightarrow{\mathrm{B}}\) and \(\overrightarrow{\mathrm{D}}=\overrightarrow{\mathrm{B}} \times \overrightarrow{\mathrm{A}}\). What is the angle between \(\overrightarrow{\mathrm{C}}\) and \(\overrightarrow{\mathrm{D}}\) ?WBJEE 2009 Easy
More PYQs from WBJEE
- The value of \(\left(\frac{1}{\log _3 12}+\frac{1}{\log _4 12}\right)\) isWBJEE 2009 Easy
- If \(\mathrm{f}(5)=7\) and \(\mathrm{f}^{\prime}(5)=7\) then \(\underset{x \rightarrow 5}{ } \frac{x f(5)-5 f(x)}{x-5}\) is given byWBJEE 2010 Easy
- The half-life for decay of \({ }^{14} \mathrm{~C, by~} \beta\) -emission is \(5730 \mathrm{yr}\). The fraction of \({ }^{14} \mathrm{C}\) decays, in a sample that is 22920 yr old, would beWBJEE 2013 Hard
- The area of the region lying above \(X\) -axis, and included between the circle \(x^{2}+y^{2}=2 a x\) and the parabola \(y^{2}=a x, a>0\) isWBJEE 2018 Medium
- If \(t_1\) and \(t_2\) be the parameters of the end points of a focal chord for the parabola \(y^2=4 a x\), then which one is true?WBJEE 2010 Easy
- In aqueous solution glucose remains asWBJEE 2011 Hard