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CBSE

NEET Physics : Moving Charges And Magnetism

Multiple Choice Questions

161.

Which of the following relation represents Biot-Savart's law ?

$\vec{dB} = \frac{μ_{0}}{4 π} \frac{\vec{dl} \times \vec{r}}{r}$
$\vec{dB} = \frac{μ_{0}}{4 π} \frac{\vec{dl} \times \overset{\land}{r}}{r^{3}}$
$\vec{dB} = \frac{μ_{0}}{4 π} \frac{\vec{dl} \times \vec{r}}{r^{3}}$
$\vec{dB} = \frac{μ_{0}}{4 π} \frac{\vec{dl} \times \vec{r}}{r^{4}}$

162.

The coil in a tangent galvanometer is 16 cm in radius. If a current of 20 mA is to produce a deflection of 45°, then the number of turns wound on it, is (Take horizontal component of earth's magnetic field = 0.36 x 10^-4 T and µ₀ = 4π x 10^-7 WbA^-1 m^-1 )

163.

The ratio of voltage sensitivity (V_S ) and current sensitivity (I_S ) of a moving coil galvanometer is

$\frac{1}{G}$
$\frac{1}{G^{2}}$
G
G²

164.

An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of

$\frac{r}{4}$
$\frac{r}{2}$
2r
4r

Short Answer Type

165.

A 50 cm long conductor AB moves with a speed 4 m/s in a magnetic field B = 0.01 Wb/m² as shown. Find the emf generated and power delivered if resistance of the circuit is 0.1 Ω.

Multiple Choice Questions

166.

An $α$ -particle with a specific charge of 2.5 × 10⁷ C-kg^-1 moves with a speed of 2 × 10⁵ ms^-1 in a perpendicular magnetic field of 0.05 T. Then the radius of the circular path described by it is

8 cm
4 cm
16 cm
2 cm

167.

A galvanometer acting as a voltmeter should have

low resistance in series with its coil
low resistance in parallel with its coil
high resistance in series with its coil
high resistance in parallel with its coil

168.

A straight conductor of length I carrying a current I, is bent in the form of a semicircle. The magnetic field (in tesla) at the centre of the semicircle is

$\frac{π^{2} I}{l} \times 10^{- 7}$
$\frac{πI}{l} \times 10^{- 7}$
$\frac{πI}{l^{2}} \times 10^{- 7}$
$\frac{{πI}^{2}}{l} \times 10^{- 7}$

169.

A particle of charge -16 x 10^-18 moving with velocity 10 ms^-1 along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 10⁴ Vm^-1 is along the negative z-axis. If the charged particle continues moving along the x-axis, then magnitude of B is

10^-3 Wbm^-2
10³ Wbm^-2
10⁵ Wbm^-2
10¹⁶ Wbm^-2

170.

In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a

helix
straight line
ellipse
circle

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NEET Physics : Moving Charges And Magnetism

Multiple Choice Questions

Short Answer Type

Multiple Choice Questions