Electromagnetic Theory [CSIR (Council of Scientific & Industrial Research) Physical Sciences]: Questions 76 - 77 of 96

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Question 76

Appeared in Year: 2022

Question MCQ▾

In an experiment to measure the charge to mass ratio e/m of the electron by Thomson՚s method, the values of the deflecting electric field and the accelerating potential are (newton per coulomb) and , respectively. The magnitude of the magnetic field that leads to zero deflection of the electron beam is closest to

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 77

Appeared in Year: 2022

Question MCQ▾

A conducting wire in the shape of a circle lies on the -plane with its centre at the origin. A bar magnet moves with a constant velocity towards the wire along the z -axis (as shown in the figure below)

A Conducting Wire in the Shape of a Circle Lies

We take to be the instant at which the midpoint of the magnet is at the centre of the wire loop and the induced current to be positive when it is counter-clockwise as viewed by the observer facing the loop and the incoming magnet. In these conventions, the best schematic representation of the induced current as a function of t, is

Choices

Choice (4)Response

a.

The Instant at Which the Midpoint of the Magnet D

b.

The Instant at Which the Midpoint of the Magnet B

c.

The Instant at Which the Midpoint of the Magnet C

d.

The Instant at Which the Midpoint of the Magnet A

Edit