Moving Charges And Magnetism, Popular Questions: Neet 1 year PHYSICS, Physics

Almas asked a question

Subject: Physics, asked on on 15/2/17

A square loop of side l is kept in a uniform magnetic field B such that its plane makes an angle 'a' with B . The loop carries a current i. The torque experienced by the loop in this position is ?
a) Bil²
b) Bil²cosa
c) Bil²sina
d) Zero
Please tell how to take angle in these kind of questions

Divyansh Bansal asked a question

Subject: Physics, asked on on 27/4/18

Solve this.
Q.11. For the arrangement shown in figure, the magnetic induction at the centre C

(1)

\frac{3 μ_{0} I}{16 R}

(2)

\frac{μ_{0} I}{16 R}

(3)

\frac{5 μ_{0} I}{16 R}

(4)

\frac{16 μ_{0} I}{5 R}

Sandali Khare asked a question

Subject: Physics, asked on on 6/4/18

a positive charge q of mass m is moving along the x axis.We wish to apply a uniform magnetic field B for time Δ t so that charge reverses its direction crossing the y axis at a distance d..Then what is the magnitude of B

Aishwarya Trivedi asked a question

Subject: Physics, asked on on 7/7/17

Q. A particle of specific charge

\frac{q}{m} = πC / kg

is projected from the origin towards positive x—axis with a velocity of 10 m/s in a uniform magnetic field

\vec{B} = - 2 \hat{k} T .

The velocity

\vec{v}

of particle after time

t = \frac{1}{12} s

will be ( in m/s )
1.

5 [\hat{i} + \sqrt{3} \hat{j}]

2.

5 [\sqrt{3} \hat{i} + \hat{j}]

3.

5 [\sqrt{3} i - \hat{j}]

4.

5 [\hat{i} + \hat{j}]

Divyansh Bansal asked a question

Subject: Physics, asked on on 27/4/18

Q2. A thin wire carrying current i is placed along positive z-axis in which current is flowing along positive z-axis. The unit vector of magnetic field at a point (a, a, 0) is
(1)

- \sqrt{2} \hat{i} + \sqrt{2} \hat{j}

(2)

(- \hat{i} - \hat{j})

(3)

- \frac{1}{\sqrt{2}} \hat{i} + \frac{1}{\sqrt{2}} \hat{j}

(4)

- \frac{1}{\sqrt{2}} \hat{i} - \frac{1}{\sqrt{2}} \hat{j}

Rayyan Mansuri asked a question

Subject: Physics, asked on on 14/8/17

A cell is connected between 2 points of a uniformly thick circular conductor.The magnetic field at the center of the loop is
a 0
b m0/2a *i1-i2
c m0/2a *i1+i2
d m0/a *i1-i2

Divyansh Bansal asked a question

Subject: Physics, asked on on 27/4/18

Solve this.
Q.2. A square loop of side a carries a current I. A uniform magnetic field B is along the z-axis. This loop is placed in magnetic field in four different manners as shown in figures.
a.

b.

c.

d.

Which manner corresponds to stable equilibrium?
(1) a
(2) b
(3) c
(4) d

Manideep Varma asked a question

Subject: Physics, asked on on 24/1/17

a current carrying circular coil of radius 6.28cm is placed with its plane in magnetic maridian.the resultant magnetic maridian.the resultant magnetic induction at the center of the coil is[given current in the coil is 3a and Bh=0.4 gauss]

Rayyan Mansuri asked a question

Subject: Physics, asked on on 14/8/17

a solenoid of 1.5 m length and 4 cm diameter possesses 10turn per cm .A current of 5 A is flowing through it.The magnetic induction at distance 12cm from the same current would be
a 2 pi*10^-3T
b 2pi*10^-5T
c 4pi*10^-2 gauss
d 2pi*10^-5 gauss

Madhura Bose asked a question

Subject: Physics, asked on on 16/1/17

_{experiment of displacement current plz explain ??}

Divyansh Bansal asked a question

Subject: Physics, asked on on 27/4/18

Solve this.
Q.10. A uniform magnetic field B and a uniform electric field E act in a region. If a charge particle enters in this region then the charged particle may remain undeflected in the region
(1)

(2)

(3)

(4)

Rayyan Mansuri asked a question

Subject: Physics, asked on on 14/8/17

2 concentric circular coils of 10 turns each are situated in the same plane. Their radii are 20cm and 40cm amd they carry a current of .2 and .3 A respectively in opp direction.The magnetic field in weber/m^2 at the centre is
a 35/4 mu0
b mu0/8
c 7/80 mu0
5/4 mu0

Aishwarya Trivedi asked a question

Subject: Physics, asked on on 12/9/17

Experts why we take the cos component in gauss law if according to this point field is always normal to the surface please explain:

2. At the surface of a charged conductor, electrostatic field must be normal to the surface at every point

If E were not normal to the surface, it would have some non-zero component along the surface. Free charges on the surface of the conductor would then experience force and move. In the static situation, therefore, E should have no tangential component. Thus electrostatic field at the surface of a charged conductor must be normal to the surface at every point. (For a conductor without any surface charge density, field is zero even at the surface.) See result 5.

Divyansh Bansal asked a question

Subject: Physics, asked on on 29/8/17

How to determine direction of magnetic field using cross product.

Divyansh Bansal asked a question

Subject: Physics, asked on on 27/4/18

Solve this.

Q . A p r o t o n m o v i n g w i t h s p e e d u a l o n g t h e p o s i t i v e x - a x i s e n t e r s a t y = 0 i n r e g i o n o f u n i f o r m m a g n e t i c f i e l d = \vec{B} = - B_{0} \hat{k} . T h e p r o t o n e x i t s f r o m t h e r e g i o n a f t e r s o m e t i m e w i t h t h e s p e e d v a t c o - o r d i n a t e y, t h e n

(1) v > u, y < 0 (2) v < u, y > 0
(3) v = u, y > 0 (4) v = u, y < 0

Sandali Khare asked a question

Subject: Physics, asked on on 6/3/18

Explain Moving of charged particles in magnetic field.

Manideep Varma asked a question

Subject: Physics, asked on on 15/7/16

an electron having a K.E of 100eVcirculates in a path of radius 10cm in a magnetic field.find the magnetic field and the no of revolution per second made by the electron

Prathiksha asked a question

Subject: Physics, asked on on 28/9/18

A straight wire of length 7m carrying a current 6A is lying on the negative y-axis . The magnetic induction at a point (12m,9m ) is of magnitude ?
plz let me know this answer sir iam tryin hard to get it but im not gettin it.

Prajnesha Singh asked a question

Subject: Physics, asked on on 27/8/17

I think the given solution is incorrrect

PLEASE SEE AND CHECK WHETHER IT IS crrct or not also i think the formula to be used is alos inccrct

Arvind asked a question

Subject: Physics, asked on on 8/4/17

Radioactive transmitter transmits at 830 kHz. At a certain distance from transmitter, magnetic field has amplitude 4.82x10^-11 T. Electric field and wavelength are:

Bhagawathgitha A Tn asked a question

Subject: Physics, asked on on 15/1/17

what is the magnetic field produced by very very thin conductor at any point of it

Kushi asked a question

Subject: Physics, asked on on 17/2/17

Sir , please explain about Biot - Savart's law in detail

Abhishek.v.j asked a question

Subject: Physics, asked on on 30/8/17

will the jee adv marks be added with mains mark while preparing rank list??