MCQs of Moving Charges & Magnetism

Moving Charges & Magnetism MCQs

MCQs of Moving Charges & Magnetism

Showing 41 to 50 out of 123 Questions

41.

If proton moves with velocity 10

\hat{i}

m/s^-1 in magnetic field having magnitude 5

\hat{j}

T, magnetic force acting on it is _____ N.

(a)	5 x 10^-18
(b)	2 x 10^-18
(c)	8 x 10^-18
(d)	10 x 10^-18

42.

Path of charged particle entering perpendicular to magnetic field will be _____ .

(a)	linear
(b)	circular
(c)	elliptical
(d)	parabolic

43.

Unit of force constant of spring in galvanometer = _____ .

(a)	Nm
(b)	$\frac{N . m}{s}$
(c)	J . rad
(d)	$\frac{N . m}{rad}$

44.

Using properly designed galvanometer electric current of _____ order can be measured.

(a)	10^-6 A
(b)	10^-3 A
(c)	10^-11 A
(d)	10^-15 A

45.

The charge on a particle is 100 times that of an electron. It is revolving in a circular path of radius 0.8 m at a frequency of 10¹¹ revolution per second. The magnetic field ad centre of path will be _____.

(a)	10^-7μ₀
(b)	$\frac{10^{- 7}}{μ_{0}}$
(c)	10¹⁷μ₀
(d)	10^-6μ₀

46.

0.5 % of the total current in ammeter passes through galvanometer. If resistance of galvanometer is G, resistance of ammeter is _____ .

(a)	$\frac{G}{200}$
(b)	$\frac{G}{194}$
(c)	119 G
(d)	200 G

47.

Two circular coils of diameters 10 and 20 cm have the same number of turns and currents. The ratio of magnetic field inductions produced at the centre of the coils, when connected in series, is _____.

(a)	1:2
(b)	2:1
(c)	3:2
(d)	2:3

48.

A very long wire is made in circular form. If its magnetic moment is M unit (MKS) due to current I passing through it, length of wire = _____ .

(a)	$\frac{4 π}{M}$
(b)	$\sqrt{\frac{4 πM}{I}}$
(c)	$\sqrt{\frac{4 πI}{M}}$
(d)	$\frac{Mπ}{4 I}$

49.

Resistance of coil of ammeter is R. Shunt required to make its range 4 times = _____ .

(a)	$\frac{R}{4}$
(b)	$\frac{R}{3}$
(c)	4R
(d)	$\frac{R}{5}$

50.

I electric current flows in a conducting wire of length L. If we bend it in a circular form its magnetic dipole moment would be _____ .

(a)	$\frac{I^{2} L}{4 π}$
(b)	$\frac{{IL}^{2}}{4 π}$
(c)	$\frac{I^{2} L^{2}}{4 π}$
(d)	$\frac{IL}{4 π}$

Showing 41 to 50 out of 123 Questions