Question

Problem 1. State which of the following statements are true or false. a. A charge moving in a magnetic field feels a force that is perpendicular to both the velocity and the direction of magnetic field. b. A change in magnetic flux leads to a change in charge in a conducting loop. c. A change in magnetic flux leads to an induction of electromotive force in a conducting loop d. A massive object can attain the speed equal to the speed of light. e. Moving charges create a magnetic field. f. Magnetic field lines outside a permanent magnet points away from north pole to south pole. g. In hydrogen atom spectra, the Balmer series lines fall into the infrared regions. h. Two straight current wires carrying current in the same direction repel each other. i. A current carrying loop in a magnetic field feels a torque, j. The energy of 15 orbital is higher than the 2P orbital.

Answer 1

a) True
becasue, F = q*(v cross B)

b) False
Becasue, charge moves in the circuit but does not change.

c) True
According to Faraday's law when magnetic flux through a loop changes emf is induced in the loop.

d) False
No object can attain speed of light

e) True

f) True

g) False

because, the balmer series lines fall in visible light region.

h) False
they attract each other

i) True

Torque acting on loop, T = N*I*A*B*sin(theta)

theta is the angle between normal to the loop and magnetic field,

j) False

as the distance between electron and nucleus increases its energy increases.

so, 2P orbital has more energy than 1S