Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 78

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Question 1
1 / -0

There is no force on moving charge, in magnetic field, when it's direction of motion is :

A
parallel to the direction of magnetic field

B
at an angle of $${45^ \circ }$$ to the magnetic field.

C
at an angle of $${30^ \circ }$$ o the magnetic field

D
perpendicular to the magnetic field

Solution
Question 2
1 / -0

An electron moves along a straight line inside a charged parallel plate capacitor of uniform surface charge density $$\sigma $$.The space between the plates is filled with constant magnetic field of induction 'B' as shown.Time taken by electron to cross the capacitor is

A
$$\cfrac { e\sigma }{ { \varepsilon }_{ 0 }lB } $$

B
$$\cfrac { { \varepsilon }_{ 0 }lB }{ \sigma } $$

C
$$\cfrac { e\sigma }{ { \varepsilon }_{ 0 }B }$$

D
$$\cfrac { { \varepsilon }_{ 0 }B }{ e\sigma } $$

Solution
Question 3
1 / -0

$$P$$ is the centre of the square $$Bp=?$$.

A
$$1\ wb/m^{2}$$

B
$$0\ wb/m^{2}$$

C
$$2\ wb/m^{2}$$

D
$$Nond\ of\ these$$

Solution
Question 4
1 / -0

The radiation corresponding to $$3\rightarrow 2$$ transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter magnetic field of $$3\times10^{-4}$$. If the radius of the largest circular path followed by these electron is 10.0 mm, the work function of the metal is close to :

A
0.8 eV

B
1.6 eV

C
1.8 eV

D
1.1 eV

Solution
Question 5
1 / -0

If an electron of mass $$m$$ revolves in a circular orbit of radius $$r$$ then gyromagnetic ratio equals to

A
$$\dfrac{e}{m}$$

B
$$em$$

C
$$\dfrac{e}{2m}$$

D
$$\dfrac{m}{2e}$$

Solution
Question 6
1 / -0

Two long, straight wires, carrying a current of $$10A$$, a placing along the X- and T-axes respectively. The currents point along the positive directions of the axes. Find the magnetic field at the points.

A
$$(1m,2m)$$

B
$$(-1m,2m)$$

C
$$(-1m,2m)$$

D
$$1m,-2m)$$

Solution
Question 7
1 / -0

Two concentric coplanar coils of equal turns have radii $$ $10 c m$$$ and $$ $30 c m$$$ respectively. Same current flowing in both the coils in the same direction. Now the direction of current is reversed in one coil then the ratio of the magnetic field at their common centre in two conditions respectively:-

A
$$ 2 : 1 $$

B
$$ 1 : 2 $$

C
$$1 : 1 $$

D
$$3 : 1 $$

Solution
Question 8
1 / -0

A conductor consists of an infinite number of adjacent wires, each infinitely long & carrying a current i. The magnetic field at all points in front of the infinite current sheet is, ( where n is the number of conductors per unit length)

A
$$B= (1/2) \mu_0ni$$

B
$$B= \mu_0ni$$

C
$$B= 2 \mu_0ni$$

D
$$B= (1/4) \mu_0ni$$

Solution
Question 9
1 / -0

A uniform magnetic filed B and a uniform electric filed E act in a common region.An electron is entering this region of space. The correct arrangement for it to escape undeviated is

A

B

C

D

Solution

For undeviated motion
$$|\vec{F_{e}}|=|\vec{F_{m}}|$$
, which happened when $$\vec{v},\vec{E}$$ and $$\vec{B}$$ are mutually perpendicular to each other.

So, option $$C$$ is correct
Question 10
1 / -0

The potential energy for a force field $$\vec {F}$$ is given by $$U(x,y)=\sin(x+y)$$. The force acting on the particle of mass $$m$$ at $$\left(0,\dfrac {\pi}{4}\right)$$ is

A
$$1$$

B
$$\sqrt {2}$$

C
$$\dfrac {1}{\sqrt {2}}$$

D
$$0$$

Solution