A coil carrying current l has radius r and number of turns n it is rewound so that radius of new coil is r/4 and it carries current l the ratio of magnetic moment of new coil to that of original coil is

Question:

Options :

(a)1
(b)1/2
(c)1/4
(d)1/8

Answer :

Ans :- (c)1/4

Answer Steps :

Step 1:-

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

If a body is executing simple harmonic motion then

Two simple harmonic motions of angular frequency 100 rad/sec and 1000 rad/s have the same displacement amplitude. The ratio of their maximum acceleration is

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