1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A balloon with mass $m$ is descending down with an acceleration $$a$$ (where, $$a < g$$ ). How much mass should be removed from it so that it starts moving up with an acceleration $$a$$ ?

A
$$\frac{2 m a}{g+a}$$
B
$$\frac{2 m a}{g-a}$$
C
$$\frac{m a}{g+a}$$
D
$$\frac{m a}{g-a}$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A straight wire of length $$2 \mathrm{~m}$$ carries a current of $$10 \mathrm{~A}$$. If this wire is placed in uniform magnetic field of $$0.15 \mathrm{~T}$$ making an angle of $$45^{\circ}$$ with the magnetic field, the applied force on the wire will be

A
$$1.5 \mathrm{~N}$$
B
$$3 \mathrm{~N}$$
C
$$3 \sqrt{2} \mathrm{~N}$$
D
$$3 / \sqrt{2} \mathrm{~N}$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two slabs are of the thicknesses $$d_1$$ and $$d_2$$. Their thermal conductivities are $$K_1$$ and $$K_2$$, respectively. They are in series. The free ends of the combination of these two slabs are kept at temperatures $$\theta_1$$ and $$\theta_2$$. Assume $$\theta_1 > \theta_2$$. The temperature $$\theta$$ of their common junction is

A
$$\frac{K_1 \theta_1+K_2 \theta_2}{\theta_1+\theta_2}$$
B
$$\frac{K_1 \theta_1 d_1+K_2 \theta_2 d_2}{K_1 d_2+K_2 d_1}$$
C
$$\frac{K_1 \theta_1 d_2+K_2 \theta_2 d_1}{K_1 d_2+K_2 d_1}$$
D
$$\frac{K_1 \theta_1+K_2 \theta_2}{K_1+K_2}$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A square wire of each side l carries a current $$I$$. The magnetic field at the mid-point of the square

COMEDK 2023 Morning Shift Physics - Moving Charges and Magnetism Question 12 English

A
$$4 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$
B
$$8 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$
C
$$16 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$
D
$$32 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$
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