A current loop placed in a magnetic field behaves like a
|
(a) Magnetic dipole |
(b) Magnetic substance |
(c) Magnetic pole |
(d) All are true |
A current loop placed in a magnetic field behaves like a
|
(a) Magnetic dipole |
(b) Magnetic substance |
(c) Magnetic pole |
(d) All are true |
(a) Magnetic dipole
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The transformation ratio in the step-up transformer is
|
(a) 1 |
|
(b) Greater than one |
|
(c) Less than one |
|
(d) The ratio greater or less than one depends on the other factors |
Blue colour of sky is due to:
If a current of 10 A flows in one second through a coil, and the induced e.m.f. is 10 V, then the self-inductance of the coil is
|
(a) |
(b) |
(c) |
(d) 1 H |
A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the axis of the loop is
|
(a) An end-on position |
(b) A broad side-on position |
|
(c) Both (a) and (b) |
(d) Neither (a) nor (b) |
Light of frequency 4n0 is incident on the metal of the threshold frequency n0. The maximum kinetic energy of the emitted photoelectrons is
|
(a) |
(b) |
(c) |
(d) |