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1
KCET 2019
MCQ (Single Correct Answer)
+1
-0

The number of turns in a coil of galvanometer is tripled, then

A
voltage sensitivity increases 3 times and current sensitivity remains constant
B
voltage sensitivity remains constant and current sensitivity increases 3 times
C
both voltage and current sensitivity remains constant
D
both voltage and current sensitivity decreases by $$33 \%$$
2
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Coersivity of a magnet where the ferromagnet gets completely demagnetized is $$3 \times 10^3 \mathrm{~Am}^{-1}$$. The minimum current required to be passes in a solenoid having 1000 turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid is

A
30 mA
B
60 mA
C
3 A
D
6 A
3
KCET 2019
MCQ (Single Correct Answer)
+1
-0

The magnetic fields at the centre O in the given figure is

KCET 2019 Physics - Moving Charges and Magnetism Question 19 English

A
$$\frac{7}{14} \frac{\mu_0 I}{R}$$
B
$$\frac{5}{12} \frac{\mu_0 I}{R}$$
C
$$\frac{3}{10} \frac{\mu_0 I}{R}$$
D
$$\frac{\mu_0 I}{12 R}$$
4
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The correct Biot-Savart law in vector form is
A
$d \mathbf{B}=\frac{\mu_0}{4 \pi} \cdot \frac{l(d \mathbf{} \times \mathbf{r})}{r^2}$
B
$d \mathbf{B}=\frac{\mu_0}{4 \pi} \cdot \frac{\mid(d \mathbf{} \mathbf{~} \times \mathbf{r})}{r^3}$
C
$d \mathbf{B}=\frac{\mu_0}{4 \pi} \cdot \frac{|d|}{r^2}$
D
$d \mathbf{B}=\frac{\mu_0}{4 \pi} \cdot \frac{|d|}{r^3}$
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