Question 4906:

A coil of copper wire of \(N\) turns is kept rotating between the poles of a permanent magnet such that the magnetic flux linking the coil changes continuously. Which of the following statements is TRUE?

A. An e.m.f. is induced in the coil such that when the change of flux is positive, the e.m.f. is positive, and when the change of flux is negative, the e.m.f. is negative
B. An e.m.f. is induced in the coil whose magnitude is inversely proportional to both the number of turns in the coil and the rate of change of magnetic flux
C. An e.m.f. is set up in the permanent magnet which reduces the flux in the coil to zero
D. A current flows in the coil and an e.m.f. is set up proportional to

Question 4907:

What is the equivalent capacitance between points \(A\) and \(B\) in the diagram below?

A. \(12.0 \mu F\)
B. \(1.1 \mu F\)
C. \(1.6 \mu F\)
D. \(7.7 \mu F\)

Question 4908:

The principle of operation of an induction coil is based on ____________

A. Ohm's law
B. Ampere's law
C. Faraday's law
D. Coulomb's law

Question 4909:

The equation
\({ }_{62}^{150} X \rightarrow{ }_{63}^{150} Y+k+\) energy
represents

A. \(\alpha\) - decay
B. \(\beta\) - decay
C. \(\gamma\)-decay
D. Photon emission

Question 4910:

Which of the following radiations cannot be deflected by an electric field or magnetic field?
(i) \(\alpha\) - rays (ii) \(\beta\) - rays (iii) \(\gamma\) - rays (iv) \(x\)-rays

A. (i) and (ii) only
B. (i) and (ii) only
C. (iii) and (iv) only
D. (i) and (iii) only