- A0
- B$\pi$
- C$\frac{\pi}{2}$
- D$\frac{\pi}{4}$
Explanation:
The phase difference between electric and magnetic fields in an electromagnetic wave is$\pi$.
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Assertion : NAND or NOR gates are called digital building blocks.
Reason : The repeated use of NAND (or NOR) gates can produce all the basic or complicated gates.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be
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(a) M/A |
(b) AIM |
(c) MA |
(d) |
The e.m.f. of a cell is E volts and internal resistance is r ohm. The resistance in external circuit is also r ohm. The p.d. across the cell will be
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(a) E/2 |
(b) 2E |
(c) 4E |
(d) E/4 |
An arc of a circle of radius R subtends an angle at the centre. It carries a current i. The magnetic field at the centre will be
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(a) |
(b) |
(c) |
(d) |
Electric potential at an equatorial point of a small dipole with dipole moment P (r, distance from the dipole) is
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(a) Zero |
(b) |
(c) |
(d) |